constrained numpy version, because latest numpy version causes a runt…

…ime error when anything tries to call 'numpy.warnings'. Additionally, added 'mat4py' to the 'pip' section of environment.yaml, because without it, a compile warning will occur, along with runtime errors about 'missing module mat4py'. Finally, in README.md, installation instructions, the step to setup the weis-env conda environment points to the develop branch's environment.yaml, so this was changed to point to the main branch's environment.yaml. (#211)

README.md

@@ -56,7 +56,7 @@ The installation instructions below use the environment name, "weis-env," but an
 
 1.  Setup and activate the Anaconda environment from a prompt (WSL terminal on Windows or Terminal.app on Mac)
 
-        conda env create --name weis-env -f https://raw.githubusercontent.com/WISDEM/WEIS/develop/environment.yml python=3.9
+        conda env create --name weis-env -f https://raw.githubusercontent.com/WISDEM/WEIS/main/environment.yml python=3.9
         conda activate weis-env                          # (if this does not work, try source activate weis-env)
         sudo apt update                                  # (WSL only, assuming Ubuntu)
 

environment.yml

@@ -23,7 +23,7 @@ dependencies:
   - markupsafe
   - matplotlib-base
   - nlopt
-  - numpy
+  - numpy=1.23.1
   - numpydoc
   - openmdao
   - openpyxl
@@ -64,6 +64,7 @@ dependencies:
   - pip:
     - fatpack
     - marmot-agents
+    - mat4py
 # Needs to be done outside of environment file:
 #  - m2w64-toolchain # [win]
 #  - libpython # [win]