doc: Update conda install instructions (#3355)

conda now provides graphicsmagick for win64, and the gmt package was just rebuilt with graphicsmagick as a runtime dependency.
GenericMappingTools · May 19, 2020 · 4020232 · 4020232
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diff --git a/INSTALL.md b/INSTALL.md
@@ -276,9 +276,6 @@ You can use the [conda package manager](https://conda.io/) that comes with the
  conda install gmt -c conda-forge
  ```
 
- NOTE: Currently conda-forge doesn't provide graphicsmagick on win-64 platform.
- Windows users need to download and install graphicsmagick separately.
-
 3. If you want to install GMT 5, use:
 
  ```