Update README.md

Expansion.

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -7,12 +7,12 @@ A lightweight JavaScript date library for parsing, validating, manipulating, and
 
 ## [Documentation](http://momentjs.com/docs/)
 
-## Port to ES6 (version 2.10.0)
+## Port to ECMAScript 6 (version 2.10.0)
 
 Moment 2.10.0 does not bring any new features, but the code is now written in
-es6 modules and placed inside `src/`. Previously `moment.js`, `locale/*.js` and
+ECMAScript 6 modules and placed inside `src/`. Previously `moment.js`, `locale/*.js` and
 `test/moment/*.js`, `test/locale/*.js` contained the source of the project. Now
-the source is in `src/`, temporary build (es5) files are placed under
+the source is in `src/`, temporary build (ECMAScript 5) files are placed under
 `build/umd/` (for running tests during development), and the `moment.js` and
 `locale/*.js` files are updated only on release.