Remove VERSION

Hard-coding the version makes it difficult to know what version
of the plugin is running, because the version displayed will be
the same regardless of which revision it was built from when
building with buck.

Remove the VERSION, so that the version of the plugin is taken
from the git describe, and thus we can see exactly what version
is running.

Change-Id: I8b39a58b784d3643724bc3459b88be34a579b6e9
diff --git a/VERSION b/VERSION
deleted file mode 100644
index 25ebda2..0000000
--- a/VERSION
+++ /dev/null
@@ -1,3 +0,0 @@
-# Maven style API version (e.g. '2.x-SNAPSHOT').
-#
-PLUGIN_VERSION = '2.12-SNAPSHOT'