bump Colors compat (#158)

Author: asinghvi17

Project.toml

@@ -19,7 +19,7 @@ Widgets = "cc8bc4a8-27d6-5769-a93b-9d913e69aa62"
 [compat]
 julia = "1"
 CSSUtil = "0.1"
-Colors = "0.10, 0.11"
+Colors = "0.10, 0.11, 0.12"
 JSExpr = "0.3,0.4,0.5"
 JSON = "0.18, 0.19, 0.20, 0.21"
 Knockout = "0.2.1"