Bump version to 4.5-alpha-1.
diff --git a/gradle.properties b/gradle.properties
index 2ccb255..f3678d1 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-thisVersion=4.5-SNAPSHOT
+thisVersion=4.5-alpha-1
 
 apiCompatVersion=4.2