deps: update old and remove unused dependencies

This commit updates all of the dependencies in package.json to
their most recent versions. It also removes dependencies that were
specified in package.json but not used - or only used in a
`require()` statement.

These changes have some ripple effects. Istanbul has not been
supported for some time, so it has been replaced with nyc.
The code coverage reporting tool from codacy has been updated
as well. This could not be tested without having the API token.

Finally, the CI job has been modified to run tests on Node.js
versions 10x and 12x. All older versions of Node.js are no longer
maintained.

Signed-off-by: Lance Ball <[email protected]>

Author: lance

.travis.yml

@@ -1,13 +1,12 @@
 language: node_js
 node_js:
-- 8
-- 7
-- 6
+- 12
+- 10
 cache: npm
 jobs:
   include:
   - stage: github release
-    node_js: '6'
+    node_js: '12'
     deploy:
       provider: releases
       api_key:
@@ -17,7 +16,7 @@ jobs:
         tags: true
 
   - stage: npm release
-    node_js: '6'
+    node_js: '12'
     deploy:
       provider: npm
       email: [email protected]

CHANGELOG.md

@@ -10,6 +10,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 - Support for mTLS in v1.0 Binary and Structured Emitters: issue [#48](https://github.com/cloudevents/sdk-javascript/issues/48). Note that this fix is only valid for v1.0 and does not address the problem in v0.3 and below.
 
+### Removed
+
+- Removed support for Node.js 6, 7 and 8 - all of which are EOL at this point. Travis CI modified to test on Node.js 10 and 12.
+
 ## [1.0.0]
 
 ### Added

lib/bindings/http/emitter_binary.js

@@ -1,5 +1,4 @@
-const axios = require("axios");
-const empty = require("is-empty");
+var axios = require("axios");
 
 const Constants = require("./constants.js");
 const defaults = {};

lib/specs/spec_0_2.js

@@ -1,6 +1,5 @@
-const uuid  = require("uuid/v4");
-const empty = require("is-empty");
-const Ajv   = require("ajv");
+var uuid  = require("uuid/v4");
+var Ajv   = require("ajv");
 
 // Reserved attributes names
 const reserved = {

lib/specs/spec_0_3.js

@@ -1,5 +1,4 @@
 const uuid  = require("uuid/v4");
-const empty = require("is-empty");
 const Ajv   = require("ajv");
 
 const {

lib/specs/spec_1.js

@@ -1,7 +1,5 @@
 const uuid  = require("uuid/v4");
-const empty = require("is-empty");
 const Ajv   = require("ajv");
-const URI   = require("uri-js");
 
 const {
   asData,