Update README.md (#240)

Author: suvarzz

README.md

@@ -3,7 +3,7 @@
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 [![Coverage Status](http://codecov.io/github/JuliaStats/Distances.jl/coverage.svg?branch=master)](http://codecov.io/github/JuliaStats/Distances.jl?branch=master)
 
-A Julia package for evaluating distances(metrics) between vectors.
+A Julia package for evaluating distances (metrics) between vectors.
 
 This package also provides optimized functions to compute column-wise and
 pairwise distances, which are often substantially faster than a straightforward