Bump pygmt from v0.2.0 to v0.2.1 (#13)

Author: weiji14

.github/workflows/repo2docker.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Setup Miniconda
-        uses: goanpeca/setup-miniconda@v1
+        uses: conda-incubator/setup-miniconda@v2
         with:
           channels: conda-forge
 

environment.yml

@@ -4,5 +4,5 @@ channels:
 dependencies:
   - python=3.8
   - gmt=6.1.1
-  - pygmt=0.2.0
+  - pygmt=0.2.1
   - jupyterlab