fix(android): set minimum API level to 19 a.k.a. 4.4 Kit Kat (googleapis#1016)

fixes googleapis#1015

Author: elharo

google-http-client-android/AndroidManifest.xml

@@ -5,7 +5,7 @@
     android:versionName="1.0" >
 
     <uses-sdk
-        android:minSdkVersion="4"
-        android:targetSdkVersion="4" />
+        android:minSdkVersion="19"
+        android:targetSdkVersion="19" />
 
-</manifest>
+</manifest>