lint: Increase max-module-lines to 3000
We have these linting issues because base_plotting.py is too long:
```
pygmt/base_plotting.py:1:0: C0302: Too many lines in module (2047/2000) (too-many-lines)
```
The problem will be fixed in but it may take some time.
This PR increases the max-module-lines to 3000 to temporarily disable the warning.
@@ -293,7 +293,7 @@ indent-string=' '
max-line-length=100
# Maximum number of lines in a module.
-max-module-lines=2000
+max-module-lines=3000
# List of optional constructs for which whitespace checking is disabled. `dict-
# separator` is used to allow tabulation in dicts, etc.: {1 : 1,\n222: 2}.
