Enable InconsistentOverloads checking in ErrorProne.

Bug:
Change-Id: I1e0be14da4ba39e3f77464e6a249aa32b1b42bb9
diff --git a/build.gradle b/build.gradle
index 9299592..c97aa9d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -23,6 +23,7 @@
     '-Xep:OvershadowingSubclassFields:WARN',
     '-Xep:IntLongMath:WARN',
     '-Xep:EqualsHashCode:WARN',
+    '-Xep:InconsistentOverloads:WARN',
     '-Xep:ArrayHashCode:WARN',
     '-Xep:EqualsIncompatibleType:WARN',
     '-Xep:NonOverridingEquals:WARN',