Include missing dependency in TestEnvironment sample code (#4908)

* Update TestEnvironment sample code to include missing dependency * Update CHANGELOG.md
jestjs · Nov 17, 2017 · 706b1c9 · 706b1c9
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -130,6 +130,7 @@
   ([#4578](https://github.com/facebook/jest/pull/4578))
 * `[jest-runtime]` Add `.advanceTimersByTime`; keep `.runTimersToTime()` as an
   alias.
+* `[docs]` Include missing dependency in TestEnvironment sample code  
 
 ## jest 21.2.1
 

diff --git a/docs/Configuration.md b/docs/Configuration.md
@@ -672,6 +672,8 @@ in their own TestEnvironment._
 Example:
 
 ```js
+const NodeEnvironment = require('jest-environment-node');
+
 class CustomEnvironment extends NodeEnvironment {
   constructor(config) {
     super(config);