Add MSRV to CI

Author: eldruin

.travis.yml

@@ -17,7 +17,7 @@ matrix:
     - env: TARGET=x86_64-unknown-linux-gnu
       rust: nightly
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
-    
+
     - env: TARGET=armv7-unknown-linux-gnueabihf
       rust: stable
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
@@ -33,6 +33,22 @@ matrix:
       rust: stable
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
 
+    # MSRV
+    - env: TARGET=armv7-unknown-linux-gnueabihf
+      rust: 1.36.0
+      if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+      addons:
+        apt:
+          packages:
+            - libc6-armhf-cross
+            - libc6-dev-armhf-cross
+            - gcc-arm-linux-gnueabihf
+
+    # MSRV
+    - env: TARGET=x86_64-unknown-linux-gnu
+      rust: 1.36.0
+      if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+
 
 before_install:
   - set -e