unpin eccodes again (#4525)

mathause · web-flow · commit 2ce1cfc3e33f · 2020-10-19T16:21:12.000-06:00
diff --git a/ci/requirements/doc.yml b/ci/requirements/doc.yml
@@ -8,7 +8,6 @@ dependencies:
   - cartopy
   - cfgrib>=0.9
   - dask>=2.10
-  - eccodes=2.18.0
   - h5netcdf>=0.7.4
   - ipykernel
   - ipython
