Release v1.3.0

[Krinkle]

After #64 lands:

--- a/History.md
+++ b/History.md
@@ -1,5 +1,10 @@
 # Release History
 
+## v1.3.0 / !!TODAY!!
+
+* Drop support for Node.js 4; This release requires Node 6 (Timo Tijhof)
+* Fix unintended flipping of selectors containing a backslash (YairRand)
+* Make cssjanus.js compatible with Closure Compiler (Chris Scribner)
+

[Krinkle]

Done.