Fix obsolete call to pkg_resources (#157)

  - This has been replaced by importlib.metadata.
    Since version 3.7 of Python is end of life, the minimal version of
    python supported is now 3.8.

Author: Laurent Franceschetti

mkdocs_macros/context.py

@@ -16,7 +16,7 @@
 import subprocess
 import platform
 import traceback
-import pkg_resources
+from importlib.metadata import version as package_version
 import datetime
 from dateutil.parser import parse as date_parse
 from functools import partial
@@ -289,8 +289,7 @@ def define_env(env):
             'system_version': system_version(),
             'python_version': python_version(),
             'mkdocs_version': mkdocs.__version__,
-            'macros_plugin_version':
-            pkg_resources.get_distribution(PACKAGE_NAME).version,
+            'macros_plugin_version': package_version(PACKAGE_NAME),
             'jinja2_version': jinja2.__version__,
             # 'site_git_version': site_git_version(),
         }

webdoc/docs/advanced.md

@@ -17,7 +17,7 @@ Including external files in pages
 ### Usage
 
 To include external files within a page, you may use the
-`include` directive from jinja2, directly in your markdown code e.g.:
+[`include` directive of jinja2](https://jinja.palletsprojects.com/en/3.1.x/templates/#include), directly in your markdown code e.g.:
 
 ```jinja2
 ## Paragraph