Deny warnings on Travis

Stjepan Glavina · Stjepan Glavina · commit d287237f7b0c · 2019-08-14T03:58:58.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,8 @@
 language: rust
 
+env:
+  - RUSTFLAGS="-D warnings"
+
 before_script:
   - rustup component add rustfmt
 
