Fix half range operator syntax change

In Xcode 6b3 the syntax of the half range operator changed to `..<`. It
was mistakenly converted to `...`
This should also change to ..<  as it was changed in this commit https://github.com/ankurp/Dollar.swift/commit/1959476cab9f6186bd4a789ad3bfdc36beae208c#diff-e1ef5c3c57609b5c595b9e9a1226c21cL834