use version number instead of release in .travis.yml (#82)

tkelman · web-flow · commit e86f103f2170 · 2017-05-26T17:58:35.000-07:00
release will change over time, but your REQUIRE file says this
package supports julia 0.5 so it should continue to be tested
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: julia
 julia:
-  - release
+  - 0.5
   - nightly
 before_script:
   - export OLD_PATH=$LD_LIBRARY_PATH
