Update history-of-javascript.md

Typos: ECMASript -> ECMAScript

content/guides/history-of-javascript.md

@@ -12,12 +12,12 @@ After the release of ES3 in 1999, there was a complete silence for a decade and
 ### From silence to ES5
 Google, Microsoft, Yahoo and other disputers of ES4 came together and decided to work on a less ambition update to ES3 tentatively named ES3.1. But the teams were still fighting about what to include from ES4 and what not. Finally, in 2009 ES5 was released mainly focusing on fixing the compabitility and security issues etc. But there wasn’t much of a splash in the water — it took ages for the vendors to incorporate the standards and many developers were still using ES3 without being aware of the “modern” standards.
 
-### Release of ES6 — ECMASript 2015
+### Release of ES6 — ECMAScript 2015
 After a few years of the release of ES5, things started to change, TC39 (the committee under ECMA international responsible for ECMAScript standardization) kept working on the next version of ECMAScript (ES6) which was originally named ES Harmony, before being eventually released with the name ES2015. ES2015 adds significant features and syntactic sugar to allow writing complex applications. Some of the features that ES6 has to offer, include Classes, Modules, Arrows, Enhanced object literals, Template strings, Destructuring, Default param values + rest + spread, Let and Const, Iterators + for..of, Generators, Maps + Sets, Proxies, Symbols, Promises, math + number + string + array + object APIs [etc](http://es6-features.org/#Constants)
 
 Browser support for ES6 is still scarce but everything that ES6 has to offer is still available to developers by transpiling the ES6 code to ES5. With the release of 6th version of ECMAScript, TC39 decided to move to yearly model of releasing updates to ECMAScript so to make sure that the new features are added as soon as they are approved and we don’t have to wait for the full specification to be drafted and approved — thus 6th version of ECMAScript was renamed as ECMAScript 2015 or ES2015 before the release in June 2015. And the next versions of ECMAScript were decided to published in June of every year.
 
-### Release of ES7 — ECMASript 2016
+### Release of ES7 — ECMAScript 2016
 In June 2016, seventh version of ECMAScript was released. As ECMAScript has been moved to an yearly release model, ECMAScript 2016 (ES2016) comparatively did not have much to offer. ES2016 includes just two new features
 
 * Exponentiation operator `**`