Bump minimum supported rust version to 1.14

kaksmet · kaksmet · commit a28c39037d26 · 2017-09-15T22:15:11.000+02:00
Recently published `flate2` 0.2.20 doesn't compile with rust 1.13.
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: rust
 rust:
-  - 1.13.0
+  - 1.14.0
   - stable
   - beta
   - nightly

-Original file line number
+Diff line change
@@ @@ -1,6 +1,6 @@ @@
 language: rust
 rust:
 -  - 1.13.0
 +  - 1.14.0
   - stable
   - beta
   - nightly