Switch to the 2018 rust edition with the latest deps.

To support the update, rust 1.34.0 is now the minimum suported version (up from 1.28.0)
BurntSushi · Apr 24, 2019 · 549f85a · 549f85a
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commit 549f85a
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diff --git a/.gitignore b/.gitignore
@@ -10,3 +10,4 @@ ctags.rust
 main
 *.idx
 builds
+.idea
diff --git a/.travis.yml b/.travis.yml
@@ -18,10 +18,10 @@ matrix:
       env: TARGET=x86_64-unknown-linux-musl
     # Minimum Rust supported channel.
     - os: linux
-      rust: 1.28.0
+      rust: 1.34.0
       env: TARGET=x86_64-unknown-linux-gnu
     - os: linux
-      rust: 1.28.0
+      rust: 1.34.0
       env: TARGET=x86_64-unknown-linux-musl
 
 before_install: