Add flutter travis yml

.travis.yml

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+os:
+  - linux
+sudo: false
+addons:
+  apt:
+    # Flutter depends on /usr/lib/x86_64-linux-gnu/libstdc++.so.6 version GLIBCXX_3.4.18
+    sources:
+      - ubuntu-toolchain-r-test # if we don't specify this, the libstdc++6 we get is the wrong version
+    packages:
+      - libstdc++6
+      - fonts-droid-fallback
+before_script:
+  - git clone https://github.com/flutter/flutter.git -b beta
+  - ./flutter/bin/flutter doctor
+script:
+  - ./flutter/bin/flutter test
+cache:
+  directories:
+    - $HOME/.pub-cache

example/ios/Podfile.lock

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+PODS:
+  - Flutter (1.0.0)
+  - headset_event (0.0.1):
+    - Flutter
+
+DEPENDENCIES:
+  - Flutter (from `.symlinks/flutter/ios`)
+  - headset_event (from `.symlinks/plugins/headset_event/ios`)
+
+EXTERNAL SOURCES:
+  Flutter:
+    :path: ".symlinks/flutter/ios"
+  headset_event:
+    :path: ".symlinks/plugins/headset_event/ios"
+
+SPEC CHECKSUMS:
+  Flutter: 58dd7d1b27887414a370fcccb9e645c08ffd7a6a
+  headset_event: 7e97247360e17f7a182fcd35a65ebfcbf9a8fac9
+
+PODFILE CHECKSUM: ebd43b443038e611b86ede96e613bd6033c49497
+
+COCOAPODS: 1.7.4