Ci: ruby 2.7 (#1100)

* ci: run against ruby 2.7

* fix ruby 2.7 warning

lib/faraday/adapter/net_http_persistent.rb:13: warning: Using the last
argument as keyword parameters is deprecated; maybe ** should be added to the
call

https://github.com/lostisland/faraday/pull/1099/checks?check_run_id=367324080
https://www.ruby-lang.org/en/news/2019/12/12/separation-of-positional-and-keyword-arguments-in-ruby-3-0/

* use rvm to install ruby 2.7

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.4.x, 2.5.x, 2.6.x]
+        ruby: ['2.4', '2.5', '2.6', '2.7']
 
     steps:
     - uses: actions/checkout@v1
@@ -47,27 +47,36 @@ jobs:
       run: |
         sudo apt-get install libcurl4-openssl-dev
 
+    - name: Set up RVM
+      run: |
+        curl -sSL https://get.rvm.io | bash
+        
     - name: Set up Ruby
-      uses: actions/setup-ruby@v1
-      with:
-        ruby-version: ${{ matrix.ruby }}
+      run: |
+        source $HOME/.rvm/scripts/rvm
+        rvm install ${{ matrix.ruby }} --disable-binary
+        rvm --default use ${{ matrix.ruby }}
 
     - name: Build
       run: |
-        gem install bundler
+        source $HOME/.rvm/scripts/rvm
+        sudo apt-get install libcurl4-openssl-dev
+        gem install bundler -v '<2'
         bundle install --jobs 4 --retry 3
 
     - name: Setup Code Climate
-      if: matrix.ruby == '2.6.x'
+      if: matrix.ruby == '2.6'
       run: |
         curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
         chmod +x ./cc-test-reporter
         ./cc-test-reporter before-build
 
     - name: Test
-      run: bundle exec rake
+      run: |
+        source $HOME/.rvm/scripts/rvm
+        bundle exec rake
 
     - name: Run Code Climate Test Reporter
-      if: success() && matrix.ruby == '2.6.x'
+      if: success() && matrix.ruby == '2.6'
       run: ./cc-test-reporter after-build --coverage-input-type simplecov --exit-code $?
       continue-on-error: true

lib/faraday/adapter/net_http_persistent.rb

@@ -16,7 +16,7 @@ module Faraday
             if @connection_options.key?(:pool_size)
               options[:pool_size] = @connection_options[:pool_size]
             end
-            Net::HTTP::Persistent.new(options)
+            Net::HTTP::Persistent.new(**options)
           else
             Net::HTTP::Persistent.new('Faraday')
           end