Drop Julia 1.2 + 1.3 in CI tests

Author: devmotion

.travis.yml

@@ -8,16 +8,11 @@ os:
   - osx
 julia:
   - 1.0
-  - 1.2
 matrix:
   include:
-    - julia: 1.3
+    - julia: 1
       env: JULIA_NUM_THREADS=1
-    - julia: 1.3
-      env: JULIA_NUM_THREADS=2
-    - julia: 1.4
-      env: JULIA_NUM_THREADS=1
-    - julia: 1.4
+    - julia: 1
       env: JULIA_NUM_THREADS=2
     - julia: nightly
       env: JULIA_NUM_THREADS=1