Update environment to be a bit more modern.

Author: ericmjl

environment.yml

@@ -1,25 +1,23 @@
 name: nams # Network Analysis Made Simple
 channels:
-  - defaults
   - conda-forge
-  - ericmjl
 dependencies:
-  - python=3.7
+  - python=3.8
   - matplotlib
   - networkx
   - scipy
   - numpy
   - nxviz
   - hiveplot
-  - jupyter=1.0.0
-  - jupyterlab=2.2.6
-  - ipykernel=5.3.4
-  - pandas=1.1.1
+  - jupyter
+  - jupyterlab
+  - ipykernel
+  - pandas>=1.0
   - rise
   - python-louvain
   - tqdm
   - ffmpeg
-  - nbstripout=0.3.9
+  - nbstripout>=0.3.9
   - pygments
   - pip
   - pyprojroot
@@ -28,8 +26,8 @@ dependencies:
   - pyjanitor
   - pre-commit
   - tabulate  # used for exporting dataframe as Markdown tables
-  - nbconvert=6.0.7
-  - nbconvert-utils=0.6
+  - nbconvert>=6.0.7
+  - nbconvert-utils>=0.6
   - pymdown-extensions
   - mkdocs-material
   - mkdocs