vendor: Update everything

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4620

vendor/github.com/gogo/protobuf/.travis.yml

@@ -1,20 +0,0 @@
-env:
-  - PROTOBUF_VERSION=2.6.1
-  - PROTOBUF_VERSION=3.0.2
-  - PROTOBUF_VERSION=3.3.0
-
-before_install:
-  - ./install-protobuf.sh
-  - PATH=/home/travis/bin:$PATH protoc --version
-
-script:
-  - PATH=/home/travis/bin:$PATH make buildserverall
-  - echo $TRAVIS_GO_VERSION
-  - if [ "$TRAVIS_GO_VERSION" == 1.8 ] && [[ "$PROTOBUF_VERSION" == 3.3.0 ]]; then ! git status --porcelain | read || (git status; git diff; exit 1); fi
-
-language: go
-
-go:
-  - 1.7.1
-  - 1.8
-