Merge branch 'release/0.18'

crystal-lang · Jun 28, 2016 · 891653c · 891653c
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+## 0.18.6 (28-06-2016)
+
+* `T?` is now parsed as `Union(T, Nil)` outside the type grammar
+* Added `String#sub` overloads for replacing an index or range with a char or string
+* [Several bugs fixes](https://github.com/crystal-lang/crystal/issues?q=milestone%3A0.18.6+is%3Aclosed)
+
 ## 0.18.5 (27-06-2016)
 
 * Added `OpenSSL::SSL::Socket#alpn_protocol`