Bump version to v1.3.8

Author: mzorz

CHANGELOG.md

@@ -1,4 +1,8 @@
 # Changelog
+## [1.3.8](https://github.com/wordpress-mobile/AztecEditor-Android/releases/tag/v1.3.8) - 2018-08-28
+### Added
+- Added the ability to use the new Android 8 feature "paste as plain text"
+
 ## [1.3.7](https://github.com/wordpress-mobile/AztecEditor-Android/releases/tag/v1.3.7) - 2018-06-29
 ### Fixed
 - Fixed initial hash calculation for change detection mechanism.

README.md

@@ -106,7 +106,7 @@ repositories {
 ```
 ```gradle
 dependencies {
-    api ('com.github.wordpress-mobile.WordPress-Aztec-Android:aztec:v1.3.7')
+    api ('com.github.wordpress-mobile.WordPress-Aztec-Android:aztec:v1.3.8')
 }
 ```