instal fewer R deps

Tim Hopper · Tim Hopper · commit 8b03fa94039c · 2018-10-18T17:02:59.000Z
diff --git a/environment.yml b/environment.yml
@@ -6,4 +6,5 @@ dependencies:
   - python>=3.6
   - pip
   - r-essentials
-  - rpy2
+  - mro-base
+  - r-ggplot2
