Added Rust 1.25.0 to CI configuration.

azriel91 · azriel91 · commit e50b0dc9f9ba · 2018-12-13T10:06:07.000+13:00
See <rust-lang-deprecated/failure#279>
diff --git a/.travis.yml b/.travis.yml
@@ -43,6 +43,10 @@ matrix:
     - rust: nightly
       script: *test_all
 
+    # Test everything on Rust 1.25.0 for backward compatibility
+    - rust: 1.25.0
+      script: *test_all
+
     # Upload docs on nightly
     - rust: nightly
       script:
