fix: Initialize submodules in gh action

.github/workflows/nosetests.yml

@@ -11,12 +11,17 @@ jobs:
         python-version: [3.6, 3.7, 3.8, 3.9]
 
     steps:
+
     - uses: actions/checkout@v2
+
     - name: Set up Python ${{matrix.python-version}}
       uses: actions/setup-python@v2
       with:
         python-version: ${{matrix.python-version}}
 
+    - name: Initialize submodules
+      run: git submodule update --init --recursive
+
     - name: Install system dependencies
       run: |
         sudo apt install libfuzzy-dev libemail-outlook-message-perl libemail-address-perl