updated changelog file

Author: raducotescu

CHANGELOG.md

@@ -1,3 +1,36 @@
+HTML Template Language Specification [1.4](https://github.com/adobe/htl-spec/tree/1.4) - June 18th, 2018
+====
+Version 1.4 brings the following enhancements:
+* `data-sly-list` and `data-sly-repeat` iteration control (#55) [0][1]
+*  the introduction of the `in` relational operator (#56) [2]
+* support for negative Number literals (#44) [3]
+* attribute identifier for the `data-sly-unwrap` block statement (#52) [4]
+* an extended list of attributes for which the `uri` display context is applied automatically (#62) [5]
+* a new block statement - `data-sly-set` [6]
+
+For a full list of issues addressed by this release please check [7].
+
+[0] - https://github.com/adobe/htl-spec/blob/1.4/SPECIFICATION.md#226-list
+[1] - https://github.com/adobe/htl-spec/blob/1.4/SPECIFICATION.md#227-repeat
+[2] - https://github.com/adobe/htl-spec/blob/1.4/SPECIFICATION.md#1143-relational-operators
+[3] - https://github.com/adobe/htl-spec/blob/1.4/SPECIFICATION.md#111-grammar
+[4] - https://github.com/adobe/htl-spec/blob/1.4/SPECIFICATION.md#2211-unwrap
+[5] - https://github.com/adobe/htl-spec/blob/1.4/SPECIFICATION.md#113-context-sensitive
+[6] - https://github.com/adobe/htl-spec/blob/1.4/SPECIFICATION.md#2212-set
+[7] - https://github.com/adobe/htl-spec/milestone/3?closed=1
+
+HTML Template Language Specification [1.3.1](https://github.com/adobe/htl-spec/tree/1.3.1) - August 1st, 2017
+====
+Enhancements:
+* corrected examples from the [URI manipulation](https://github.com/adobe/htl-spec/blob/1.3.1/SPECIFICATION.md#125-uri-manipulation) section
+* added paragraph about the style and the event attributes for the `data-sly-attribute` block element
+
+HTML Template Language Specification [1.3](https://github.com/adobe/htl-spec/tree/1.3) - March 16th, 2017
+====
+New features:
+- the [`format`](https://github.com/adobe/htl-spec/blob/1.3/SPECIFICATION.md#122-format) option has been extended to allow formatting `strings`, `dates` and `numbers`
+
+
 HTML Template Language Specification [1.2](https://github.com/adobe/htl-spec/tree/1.2) - March 30th, 2016
 ====