remove invisible white space

Author: fangq

.github/workflows/run_test.yml

@@ -17,15 +17,15 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Setup Python2 (Linux)
-       if: matrix.python-version == '2.7' && startsWith(matrix.os, 'ubuntu')
-       run: |
+        if: matrix.python-version == '2.7' && startsWith(matrix.os, 'ubuntu')
+        run: |
           sudo ln -fs python2 /usr/bin/python
-         sudo apt-get update
-         sudo apt-get install python-setuptools python-dev
-         curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
-         sudo python2 get-pip.py
-         ls -l /usr/bin/pip* /usr/local/bin/pip*
-         which pip
+          sudo apt-get update
+          sudo apt-get install python-setuptools python-dev
+          curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
+          sudo python2 get-pip.py
+          ls -l /usr/bin/pip* /usr/local/bin/pip*
+          which pip
       - name: Install packages
         run: |
           sudo apt-get install cython3 lcov