Add compat required version

Chris Foster · Chris Foster · commit 2ba383951453 · 2016-07-12T11:55:12.000+10:00
diff --git a/REQUIRE b/REQUIRE
@@ -1,4 +1,4 @@
 julia 0.4
-Compat
+Compat 0.8
 FixedSizeArrays 0.2.2
 Rotations
