Bump to 1.15.4 release

Author: rogerhu

Parse/build.gradle

@@ -5,7 +5,7 @@ apply plugin: 'com.github.kt3k.coveralls'
 apply plugin: 'com.jfrog.bintray'
 
 group = 'com.parse'
-version = '1.15.4-SNAPSHOT'
+version = '1.15.4'
 
 ext {
     projDescription = 'A library that gives you access to the powerful Parse cloud platform from your Android app.'

README.md

@@ -15,7 +15,7 @@ Download [the latest JAR][latest] or define in Gradle:
 
 ```groovy
 dependencies {
-  compile 'com.parse:parse-android:1.15.3'
+  compile 'com.parse:parse-android:1.15.4'
 }
 ```