use_alloc build for Travis CI; increase MSRV to 1.36.0

Author: jswrenn

.travis.yml

@@ -2,22 +2,25 @@ language: rust
 sudo: false
 matrix:
   include:
-    - rust: 1.32.0
+    - rust: 1.36.0
       script:
         - |
             cargo build --verbose --no-default-features &&
+            cargo build --verbose --no-default-features --features "use_alloc" &&
             cargo build --verbose --features "$FEATURES"
     - rust: stable
       script:
         - |
             cargo build --verbose --no-default-features &&
+            cargo build --verbose --no-default-features --features "use_alloc" &&
             cargo build --verbose --features "$FEATURES" &&
             cargo test --verbose --features "$FEATURES" &&
             cargo bench --no-run --verbose --features "$FEATURES"
     - rust: beta
       script:
         - |
             cargo build --verbose --no-default-features &&
+            cargo build --verbose --no-default-features --features "use_alloc" &&
             cargo build --verbose --features "$FEATURES" &&
             cargo test --verbose --features "$FEATURES" &&
             cargo bench --no-run --verbose --features "$FEATURES"