README code sample fix when using Robolectric 
README code sample fix when using Robolectric 

`setupLeakCanary()` method that was added for Robolectric test's ability to override setting up LeakCanary wasn't returning any value for the analyzer process check, which does not compile.  Added the `DISABLED` return value for when in the "Analyzer" process is detected.
square/leakcanary,square/leakcanary,square/leakcanary