Don't test 1.25.0 on Travis, nom 4.1 dropped its support.

progval · progval · commit 36d4744cc752 · 2018-10-28T15:37:36.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,5 @@
 language: rust
 rust:
-  - 1.25.0
   - stable
   - beta
   - nightly

-Original file line number
+Diff line change
@@ @@ -1,6 +1,5 @@ @@
 language: rust
 rust:
 -  - 1.25.0
   - stable
   - beta
   - nightly