Bump to PyGMT v0.16.0 (#58)

* Update environment.yml

* Update README.md

Author: seisman

README.md

@@ -20,7 +20,7 @@ Run it online by clicking on one of the badges below:
 - **Julia**: 1.10
 - **GMT.jl**: 1.x
 - **Python**: 3.13
-- **PyGMT**: 0.15.0
+- **PyGMT**: 0.16.0
 - **Geopandas**: 1.0.1
 
 ## Reference

environment.yml

@@ -5,7 +5,7 @@ channels:
 dependencies:
   - python=3.13
   - gmt=6.5.0
-  - pygmt=0.15.0
+  - pygmt=0.16.0
   - jupyterlab=4.3.6
   - jupyter-offlinenotebook=0.3.1
   # Optional dependencies