Generate changelog for v1.8.1 (#887)

Author: johanbrandhorst

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Change Log
 
+## [v1.8.1-pre1](https://github.com/grpc-ecosystem/grpc-gateway/tree/v1.8.1-pre1) (2019-03-01)
+[Full Changelog](https://github.com/grpc-ecosystem/grpc-gateway/compare/v1.8.0...v1.8.1-pre1)
+
+**Merged pull requests:**
+
+- CI: fix release builds [\#884](https://github.com/grpc-ecosystem/grpc-gateway/pull/884) ([johanbrandhorst](https://github.com/johanbrandhorst))
+
 ## [v1.8.0](https://github.com/grpc-ecosystem/grpc-gateway/tree/v1.8.0) (2019-03-01)
 [Full Changelog](https://github.com/grpc-ecosystem/grpc-gateway/compare/v1.7.0...v1.8.0)
 
@@ -27,6 +34,7 @@
 
 **Merged pull requests:**
 
+- Generate changelog for 1.8.0 [\#883](https://github.com/grpc-ecosystem/grpc-gateway/pull/883) ([johanbrandhorst](https://github.com/johanbrandhorst))
 - Read only support [\#882](https://github.com/grpc-ecosystem/grpc-gateway/pull/882) ([hypnoce](https://github.com/hypnoce))
 - Add fqn\_for\_swagger\_name option [\#881](https://github.com/grpc-ecosystem/grpc-gateway/pull/881) ([hypnoce](https://github.com/hypnoce))
 - go.mod: update grpc from v1.16.0 to v1.17.0 [\#880](https://github.com/grpc-ecosystem/grpc-gateway/pull/880) ([klim0v](https://github.com/klim0v))