updated to 1.7.9 to hotfix crashes related to proguard

Author: Victor Ng

android/build.gradle

@@ -1,7 +1,7 @@
 // each of the version numbers must be 0-99
 def versionMajor = 1
 def versionMinor = 7 // minor feature releases
-def versionPatch = 8 // This should be bumped for hot fixes
+def versionPatch = 9 // This should be bumped for hot fixes
 
 // Double check the versioning
 for (versionPart in [versionPatch, versionMinor, versionMajor]) {