chore: add metadata and mkdocs-simple-plugin version requirements

Also update installation instructions now that pip can get simple
  from pip rather than by cloning. Should be ready for submission to PyPI.

  Resolves #7.

.drone.yml

@@ -20,16 +20,8 @@ steps:
 ### install
 # ## Installation
 #
-# At the moment, `semiliterate` relies on the latest pre-release version of
-# `mkdocs-simple-plugin`. Therefore, you must clone and install that repository
-# before installing `semiliterate`.
-# ```
-      - git clone https://github.com/athackst/mkdocs-simple-plugin.git
-      - cd mkdocs-simple-plugin
-      - pip install .
-# ```
-# Once that's in place, you can install semiliterate; right now as there has
-# not yet been a release, you should do that by cloning  and installing as well:
+# Since there has not yet been a release of mkdocs-semiliterate,
+# you should install it by cloning the repository:
 # ```
 # git clone https://code.studioinfinity.org/glen/mkdocs-semiliterate
 # cd mkdocs-semiliterate

mkdocs_semiliterate/__init__.py

@@ -0,0 +1 @@
+"""mkdocs_semiliterate package."""

setup.cfg

@@ -1,12 +1,30 @@
 [metadata]
 name = mkdocs-semiliterate
-version = 0.0.13
+version = 0.1.0
+description = Extension of mkdocs-simple-plugin adding easy content inclusion
+long_description = file: README.md
+long_description_content_type = text/markdown
+keywords = mkdocs literate
+url = http://studioinfinity.org/semiliterate
+project_urls =
+  Issues = https://code.studioinfinity.org/glen/mkdocs-semiliterate/issues,
+  Documentation = http://studioinfinity.org/semiliterate,
+  Source Code = http://code.studioinfinity.org/glen/mkdocs-semiliterate
+author = Glen Whitney
+author_email = glen@studioinfinity.org
+classifiers =
+  Development Status :: 4 - Beta
+  Intended Audience :: Developers
+  Intended Audience :: Information Technology
+  Programming Language :: Python
+  Programming Language :: Python :: 3 :: Only
+license = Apache-2.0
 
 [options]
 packages = mkdocs_semiliterate
 install_requires =
   mkdocs
-  mkdocs-simple-plugin
+  mkdocs-simple-plugin>=0.4.0
 
 [options.entry_points]
 mkdocs.plugins =