use standard pre release version

bolandrm · bolandrm · commit 8e2e042b5d8f · 2015-10-14T09:56:04.000-04:00
diff --git a/lib/sassc/version.rb b/lib/sassc/version.rb
@@ -1,3 +1,3 @@
 module SassC
-  VERSION = "1.8.0-beta1"
+  VERSION = "1.8.0.pre1"
 end
