Update 'protocol' API version to match client version major.minor.

Author: Quintin Willison

lib/src/main/java/io/ably/lib/transport/Defaults.java

@@ -7,7 +7,7 @@
 
 public class Defaults {
 	/* versions */
-	public static final float ABLY_VERSION_NUMBER   = 1.0f;
+	public static final float ABLY_VERSION_NUMBER   = 1.2f;
 	public static final String ABLY_VERSION         = new DecimalFormat("0.0").format(ABLY_VERSION_NUMBER);
 	public static final String ABLY_LIB_VERSION     = String.format("%s-%s", BuildConfig.LIBRARY_NAME, BuildConfig.VERSION);