Add optional dependencies to pyproject.toml (#2069)

Co-authored-by: Wei Ji <[email protected]>

Author: seisman

doc/install.rst

@@ -218,6 +218,11 @@ This installs the latest stable release from
 
     pip install pygmt
 
+.. tip::
+
+   You can also run ``pip install pygmt[all]`` to install pygmt with
+   all of its optional dependencies.
+
 Alternatively, you can install the latest development version from
 `TestPyPI <https://test.pypi.org/project/pygmt>`__::
 

pyproject.toml

@@ -32,6 +32,12 @@ dependencies = [
 ]
 dynamic = ["version"]
 
+[project.optional-dependencies]
+all = [
+    "geopandas",
+    "ipython"
+]
+
 [project.urls]
 homepage = "https://www.pygmt.org"
 documentation = "https://www.pygmt.org"