use 0.6.0-pre for minimum julia version in REQUIRE

`const PooledVector{T,R}` syntax would not work in early 0.6.0-dev version, so better to stick with the julia-0.5-compatible version of the package there
JuliaData · May 25, 2017 · e826eeb · e826eeb
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-julia 0.6-
+julia 0.6.0-pre