Use a specific version of rustc nightly.

Because rust-lang/rust#49305 removed the TryFrom conversions from usize (temporarily), we have to use a fixed version of rustc. It's unclear when we'll be able to revert this :/
softdevteam · Apr 3, 2018 · 34e9077 · 34e9077
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commit 34e9077
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,3 @@
 language: rust
-rust: nightly
+rust: nightly-2018-03-25