Use circle-ci for Android

.circleci/config.yml

@@ -0,0 +1,23 @@
+version: 2
+
+jobs:
+
+  test:
+    working_directory: ~/tgst
+    docker:
+      - image: tomaka/cargo-apk
+    steps:
+      - checkout
+      - restore_cache:
+          key: test-cache-{{ checksum "Cargo.lock" }}
+      - run: cargo apk build --example window
+      - save_cache:
+          key: test-cache-{{ checksum "Cargo.lock" }}
+          paths:
+            - target
+
+workflows:
+  version: 2
+  build-test-and-deploy:
+    jobs:
+      - test

.travis.yml

@@ -1,8 +1,3 @@
-sudo: required
-
-services:
-  - docker
-  
 language: rust
 
 rust:
@@ -26,7 +21,6 @@ script:
   - cargo build --verbose
   - if [ $TRAVIS_OS_NAME = osx ]; then cargo build --target x86_64-apple-ios --verbose; fi
   - cargo test --verbose
-  - docker run --rm -v "$(pwd):/root/src" -w /root/src tomaka/cargo-apk cargo apk build --example window --verbose
 
 os:
   - linux