add an explicit version to check in CI

KodrAus · web-flow · commit ab51aaac0b5a · 2019-02-05T11:29:22.000+10:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,6 @@
 language: rust
 rust:
+  - 1.23.0
   - stable
   - beta
   - nightly

-Original file line number
+Diff line change
@@ @@ -1,5 +1,6 @@ @@
 language: rust
 rust:
 +  - 1.23.0
   - stable
   - beta
   - nightly