Bump minimum Rust to 1.12.0

hcpl · hcpl · commit 97c59e352079 · 2019-01-27T22:59:36.000+02:00
Rust 1.11 had an old behaviour for `tt` matchers that has been fixed in Rust 1.12 (rust-lang/rust#34908).
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,6 @@ language: rust
 rust:
   - beta
   - stable
-  - 1.11.0
+  - 1.12.0
 script:
   - cargo test

-Original file line number
+Diff line change
 rust:
   - beta
   - stable
 -  - 1.11.0
 +  - 1.12.0
 script:
   - cargo test