Merge pull request #4164 from freqtrade/ci_macos_39

Run CI for mac on 3.9

.github/workflows/ci.yml

@@ -117,7 +117,7 @@ jobs:
     strategy:
       matrix:
         os: [ macos-latest ]
-        python-version: [3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2
@@ -146,8 +146,9 @@ jobs:
       run: |
         cd build_helpers && ./install_ta-lib.sh ${HOME}/dependencies/; cd ..
 
-    - name: Installation - *nix
+    - name: Installation - macOS
       run: |
+        brew install hdf5 c-blosc
         python -m pip install --upgrade pip
         export LD_LIBRARY_PATH=${HOME}/dependencies/lib:$LD_LIBRARY_PATH
         export TA_LIBRARY_PATH=${HOME}/dependencies/lib

docs/installation.md

@@ -245,6 +245,19 @@ open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10
 
 If this file is inexistent, then you're probably on a different version of MacOS, so you may need to consult the internet for specific resolution details.
 
+### MacOS installation error with python 3.9
+
+When using python 3.9 on macOS, it's currently necessary to install some os-level modules to allow dependencies to compile.
+The errors you'll see happen during installation and are related to the installation of `tables` or `blosc`.
+
+You can install the necessary libraries with the following command:
+
+``` bash
+brew install hdf5 c-blosc
+```
+
+After this, please run the installation (script) again.
+
 -----
 
 Now you have an environment ready, the next step is