Merge #46

46: travis: stable r=jordens a=jordens

bors r+

Co-authored-by: Robert Jördens <rj@quartiq.de>

.travis.yml

@@ -2,12 +2,12 @@ language: rust
 
 matrix:
   include:
-    - rust: nightly
+    - rust: stable
       env: FEATURES='' ARGS='--release'
-    - rust: nightly
+    - rust: stable
       env: FEATURES='semihosting'
-    - rust: nightly
-      env: FEATURES='bkpt'
+    - rust: beta
+      env: FEATURES='' ARGS='--release'
 
 branches:
   only: