deps: bump mkdocs-material from 7.1.7 to 7.1.8 (peaceiris#217)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 7.1.7 to 7.1.8.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/docs/changelog.md)
- [Commits](squidfunk/mkdocs-material@7.1.7...7.1.8)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Diff for: Pipfile

@@ -5,7 +5,7 @@ verify_ssl = true
 
 [packages]
 mkdocs = "==1.2.1"
-mkdocs-material = "==7.1.7"
+mkdocs-material = "==7.1.8"
 python-markdown-math = "==0.8"
 Pygments = "==2.9.0"
 prompt_toolkit = "==3.0.18"

Diff for: Pipfile.lock

@@ -1,2 +1,35 @@
+#
+# These requirements were autogenerated by pipenv
+# To regenerate from the project's Pipfile, run:
+#
+#    pipenv lock --requirements --dev
+#
+
+# Note: in pipenv 2020.x, "--dev" changed to emit both default and development
+# requirements. To emit only development requirements, pass "--dev-only".
+
 -i https://pypi.org/simple/
+click==8.0.1; python_version >= '3.6'
+ghp-import==2.0.1
+importlib-metadata==4.5.0; python_version >= '3.6'
 invoke==1.5.0
+jinja2==3.0.1
+markdown==3.3.4; python_version >= '3.6'
+markupsafe==2.0.1; python_version >= '3.6'
+mergedeep==1.3.4; python_version >= '3.6'
+mkdocs-material-extensions==1.0.1; python_version >= '3.5'
+mkdocs-material==7.1.8
+mkdocs==1.2.1
+packaging==20.9; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+prompt-toolkit==3.0.18
+pygments==2.9.0
+pymdown-extensions==8.2; python_version >= '3.6'
+pyparsing==3.0.0b2; python_version >= '3.5'
+python-dateutil==2.8.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+python-markdown-math==0.8
+pyyaml-env-tag==0.1; python_version >= '3.6'
+pyyaml==5.4.1
+six==1.16.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+watchdog==2.1.2; python_version >= '3.6'
+wcwidth==0.2.5
+zipp==3.4.1; python_version >= '3.6'

Diff for: requirements-dev.txt

@@ -1,24 +1,31 @@
+#
+# These requirements were autogenerated by pipenv
+# To regenerate from the project's Pipfile, run:
+#
+#    pipenv lock --requirements
+#
+
 -i https://pypi.org/simple/
-click==8.0.1
+click==8.0.1; python_version >= '3.6'
 ghp-import==2.0.1
-importlib-metadata==4.5.0
+importlib-metadata==4.5.0; python_version >= '3.6'
 jinja2==3.0.1
-markdown==3.3.4
-markupsafe==2.0.1
-mergedeep==1.3.4
-mkdocs-material-extensions==1.0.1
-mkdocs-material==7.1.7
+markdown==3.3.4; python_version >= '3.6'
+markupsafe==2.0.1; python_version >= '3.6'
+mergedeep==1.3.4; python_version >= '3.6'
+mkdocs-material-extensions==1.0.1; python_version >= '3.5'
+mkdocs-material==7.1.8
 mkdocs==1.2.1
-packaging==20.9
+packaging==20.9; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 prompt-toolkit==3.0.18
 pygments==2.9.0
-pymdown-extensions==8.2
-pyparsing==3.0.0b2
-python-dateutil==2.8.1
+pymdown-extensions==8.2; python_version >= '3.6'
+pyparsing==3.0.0b2; python_version >= '3.5'
+python-dateutil==2.8.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 python-markdown-math==0.8
-pyyaml-env-tag==0.1
+pyyaml-env-tag==0.1; python_version >= '3.6'
 pyyaml==5.4.1
-six==1.16.0
-watchdog==2.1.2
+six==1.16.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+watchdog==2.1.2; python_version >= '3.6'
 wcwidth==0.2.5
-zipp==3.4.1
+zipp==3.4.1; python_version >= '3.6'