use github actions for CI instead of travis (#23)

* use github actions for CI instead of travis

Author: tdtds

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: 不具合の報告
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug / 不具合の説明**
+A clear and concise description of what the bug is.
+
+**To Reproduce / 再現手順**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior / 期待した動作**
+A clear and concise description of what you expected to happen.
+
+**Screenshots / スクリーンショット**
+If applicable, add screenshots to help explain your problem.
+
+**Environment / 動作環境**
+ - OS: 
+ - Browser: 
+ - tDiary Version:
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/dependabot.yml

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+version: 2
+updates:
+- package-ecosystem: bundler
+  directory: "/"
+  schedule:
+    interval: weekly
+    time: '20:00'
+  open-pull-requests-limit: 10

.github/workflows/ci.yml

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+name: ubuntu
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: build (${{ matrix.ruby }}/${{ matrix.test_mode }})
+    strategy:
+      matrix:
+        ruby: [ '3.0', 2.7, 2.6 ]
+        test_mode: [ rack, gem ]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+    - uses: niden/actions-memcached@v7
+    - name: Install dependencies
+      run: |
+        sudo apt-get update && sudo apt-get -y install libidn11-dev
+        echo 'gemspec' > Gemfile.local
+        gem update bundler --no-document
+        bundle install --without server --jobs=3 --retry=3
+        npm install
+    - name: Run test
+      run: bundle exec rake spec
+      env:
+        TEST_MODE: ${{ matrix.test_mode }}