fix multiplatform build

Author: luk036

.github/workflows/multi-platforms.yml

@@ -31,9 +31,11 @@ jobs:
         shell: bash -l {0}
         run: |
             conda install pytest
-            python setup.py develop
+            python -m pip install --upgrade pip
+            if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
             git clone https://github.com/luk036/pylds
             cd pylds; python setup.py develop; cd ..
             git clone https://github.com/luk036/netoptim
             cd netoptim; python setup.py develop; cd ..
+            python setup.py develop
             pytest