Drop Julia 0.4 support

avoid introducing new deprecations on a version of Julia that
many packages are not introducing new release on

Author: tkelman

.travis.yml

@@ -3,7 +3,6 @@ os:
     - linux
     - osx
 julia:
-    - 0.4
     - 0.5
     - nightly
 notifications:

REQUIRE

@@ -1,2 +1,2 @@
-julia 0.4
+julia 0.5
 Compat 0.9.1

appveyor.yml

@@ -1,7 +1,5 @@
 environment:
   matrix:
-  - JULIAVERSION: "julialang/bin/winnt/x86/0.4/julia-0.4-latest-win32.exe"
-  - JULIAVERSION: "julialang/bin/winnt/x64/0.4/julia-0.4-latest-win64.exe"
   - JULIAVERSION: "julialang/bin/winnt/x86/0.5/julia-0.5-latest-win32.exe"
   - JULIAVERSION: "julialang/bin/winnt/x64/0.5/julia-0.5-latest-win64.exe"
   - JULIAVERSION: "julianightlies/bin/winnt/x86/julia-latest-win32.exe"