fix: Corrected slack link (#446)

Signed-off-by: Rajiv Ranjan Singh <[email protected]>

Author: iamrajiv

README.md

@@ -7,16 +7,16 @@
 [![codecov](https://codecov.io/gh/grpc-ecosystem/go-grpc-middleware/branch/master/graph/badge.svg)](https://codecov.io/gh/grpc-ecosystem/go-grpc-middleware)
 [![Apache 2.0 License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
 [![quality: production](https://img.shields.io/badge/quality-production-orange.svg)](#status)
-[![Slack](https://img.shields.io/badge/slack-%23grpc--middleware-brightgreen)](https://slack.com/share/IRUQCFC23/9Tm7hxRFVKKNoajQfMOcUiIk/enQtODc4ODI4NTIyMDcxLWM5NDA0ZTE4Njg5YjRjYWZkMTI5MzQwNDY3YzBjMzE1YzdjOGM5ZjI1NDNiM2JmNzI2YjM5ODE5OTRiNTEyOWE)
+[![Slack](https://img.shields.io/badge/slack-%23grpc--middleware-brightgreen)](https://gophers.slack.com/archives/CNJL30P4P)
 
 [gRPC Go](https://github.com/grpc/grpc-go) Middleware: interceptors, helpers, utilities.
 
 ## Middleware
 
 [gRPC Go](https://github.com/grpc/grpc-go) recently acquired support for
-Interceptors, i.e. [middleware](https://medium.com/@matryer/writing-middleware-in-golang-and-how-go-makes-it-so-much-fun-4375c1246e81#.gv7tdlghs) 
+Interceptors, i.e. [middleware](https://medium.com/@matryer/writing-middleware-in-golang-and-how-go-makes-it-so-much-fun-4375c1246e81#.gv7tdlghs)
 that is executed either on the gRPC Server before the request is passed onto the user's application logic, or on the gRPC client around the user call. It is a perfect way to implement
-common patterns: auth, logging, message, validation, retries or monitoring.
+common patterns: auth, logging, message, validation, retries, or monitoring.
 
 These are generic building blocks that make it easy to build multiple microservices easily.
 The purpose of this repository is to act as a go-to point for such reusable functionality. It contains
@@ -49,35 +49,39 @@ myServer := grpc.NewServer(
 
 ## Interceptors
 
-*Please send a PR to add new interceptors or middleware to this list*
+_Please send a PR to add new interceptors or middleware to this list_
 
 #### Auth
-   * [`grpc_auth`](auth) - a customizable (via `AuthFunc`) piece of auth middleware 
+
+- [`grpc_auth`](auth) - a customizable (via `AuthFunc`) piece of auth middleware
 
 #### Logging
-   * [`grpc_ctxtags`](tags/) - a library that adds a `Tag` map to context, with data populated from request body
-   * [`grpc_zap`](logging/zap/) - integration of [zap](https://github.com/uber-go/zap) logging library into gRPC handlers.
-   * [`grpc_logrus`](logging/logrus/) - integration of [logrus](https://github.com/sirupsen/logrus) logging library into gRPC handlers.
-   * [`grpc_kit`](logging/kit/) - integration of [go-kit/log](https://github.com/go-kit/log) logging library into gRPC handlers.
-   * [`grpc_grpc_logsettable`](logging/settable/) - a wrapper around `grpclog.LoggerV2` that allows to replace loggers in runtime (thread-safe).
+
+- [`grpc_ctxtags`](tags/) - a library that adds a `Tag` map to context, with data populated from request body
+- [`grpc_zap`](logging/zap/) - integration of [zap](https://github.com/uber-go/zap) logging library into gRPC handlers.
+- [`grpc_logrus`](logging/logrus/) - integration of [logrus](https://github.com/sirupsen/logrus) logging library into gRPC handlers.
+- [`grpc_kit`](logging/kit/) - integration of [go-kit/log](https://github.com/go-kit/log) logging library into gRPC handlers.
+- [`grpc_grpc_logsettable`](logging/settable/) - a wrapper around `grpclog.LoggerV2` that allows to replace loggers in runtime (thread-safe).
 
 #### Monitoring
-   * [`grpc_prometheus`⚡](https://github.com/grpc-ecosystem/go-grpc-prometheus) - Prometheus client-side and server-side monitoring middleware
-   * [`otgrpc`⚡](https://github.com/grpc-ecosystem/grpc-opentracing/tree/master/go/otgrpc) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors
-   * [`grpc_opentracing`](tracing/opentracing) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors with support for streaming and handler-returned tags
+
+- [`grpc_prometheus`⚡](https://github.com/grpc-ecosystem/go-grpc-prometheus) - Prometheus client-side and server-side monitoring middleware
+- [`otgrpc`⚡](https://github.com/grpc-ecosystem/grpc-opentracing/tree/master/go/otgrpc) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors
+- [`grpc_opentracing`](tracing/opentracing) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors with support for streaming and handler-returned tags
 
 #### Client
-   * [`grpc_retry`](retry/) - a generic gRPC response code retry mechanism, client-side middleware
+
+- [`grpc_retry`](retry/) - a generic gRPC response code retry mechanism, client-side middleware
 
 #### Server
-   * [`grpc_validator`](validator/) - codegen inbound message validation from `.proto` options
-   * [`grpc_recovery`](recovery/) - turn panics into gRPC errors
-   * [`ratelimit`](ratelimit/) - grpc rate limiting by your own limiter
 
+- [`grpc_validator`](validator/) - codegen inbound message validation from `.proto` options
+- [`grpc_recovery`](recovery/) - turn panics into gRPC errors
+- [`ratelimit`](ratelimit/) - grpc rate limiting by your own limiter
 
 ## Status
 
-This code has been running in *production* since May 2016 as the basis of the gRPC micro services stack at [Improbable](https://improbable.io).
+This code has been running in _production_ since May 2016 as the basis of the gRPC microservices stack at [Improbable](https://improbable.io).
 
 Additional tooling will be added, and contributions are welcome.