Bump minimum Julia version to 0.6

Author: ararslan

.travis.yml

@@ -3,8 +3,7 @@ os:
   - linux
   - osx
 julia:
-  - 0.4
-  - 0.5
+  - 0.6
   - nightly
 notifications:
   email: false

README.md

@@ -2,8 +2,6 @@
 
 [![Build Status](https://travis-ci.org/JuliaStats/KernelDensity.jl.svg?branch=master)](https://travis-ci.org/JuliaStats/KernelDensity.jl)
 [![Coverage Status](https://coveralls.io/repos/github/JuliaStats/KernelDensity.jl/badge.svg)](https://coveralls.io/github/JuliaStats/KernelDensity.jl)
-[![KernelDensity](http://pkg.julialang.org/badges/KernelDensity_0.4.svg)](http://pkg.julialang.org/?pkg=KernelDensity)
-[![KernelDensity](http://pkg.julialang.org/badges/KernelDensity_0.5.svg)](http://pkg.julialang.org/?pkg=KernelDensity)
 [![KernelDensity](http://pkg.julialang.org/badges/KernelDensity_0.6.svg)](http://pkg.julialang.org/?pkg=KernelDensity)
 
 Kernel density estimators for Julia.

REQUIRE

@@ -1,4 +1,4 @@
-julia 0.4
+julia 0.6
 Compat 0.17
 StatsBase
 Distributions