MAINT: update .travis

Author: bluss

.travis.yml

@@ -4,34 +4,27 @@ env:
   - FEATURES='serde-1'
 matrix:
   include:
-    - rust: 1.14.0
+    - rust: 1.21.0
     - rust: stable
       env:
         - NODEFAULT=1
-        - NODROP_FEATURES='use_needs_drop'
     - rust: beta
     - rust: nightly
       env:
         - NODEFAULT=1
     - rust: nightly
-      env:
-      - NODROP_FEATURES='use_needs_drop'
     - rust: nightly
       env:
-      - FEATURES='serde use_union'
-      - NODROP_FEATURES='use_union'
+      - FEATURES='serde'
 branches:
   only:
     - master
     - 0.3
 script:
   - |
-      ([ ! -z "$NODROP_FEATURES" ] || cargo build --verbose --features "$FEATURES") &&
+      cargo build --verbose --features "$FEATURES" &&
       ([ "$NODEFAULT" != 1 ] || cargo build --verbose --no-default-features) &&
-      ([ ! -z "$NODROP_FEATURES" ] || cargo test --verbose --features "$FEATURES") &&
-      ([ ! -z "$NODROP_FEATURES" ] || cargo test --release --verbose --features "$FEATURES") &&
-      ([ ! -z "$NODROP_FEATURES" ] || cargo bench --verbose --features "$FEATURES" -- --test) &&
-      ([ ! -z "$NODROP_FEATURES" ] || cargo doc --verbose --features "$FEATURES") &&
-      ([ "$NODEFAULT" != 1 ] || cargo build --verbose --manifest-path=nodrop/Cargo.toml --no-default-features) &&
-      cargo test --verbose --manifest-path=nodrop/Cargo.toml --features "$NODROP_FEATURES" &&
-      cargo bench --verbose --manifest-path=nodrop/Cargo.toml --features "$NODROP_FEATURES" -- --test
+      cargo test --verbose --features "$FEATURES" &&
+      cargo test --release --verbose --features "$FEATURES" &&
+      cargo bench --verbose --features "$FEATURES" -- --test &&
+      cargo doc --verbose --features "$FEATURES"