use 0.6.0-pre as minimum julia version in REQUIRE (#9)

`abstract type` wouldn't work on early 0.6.0-dev versions, so the package shouldn't claim to support them
KristofferC · May 25, 2017 · 8d80856 · 8d80856
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-julia 0.6-
+julia 0.6.0-pre
 MacroTools
 DataStructures
 Requires