Bump pymdown-extensions from 7.0b2 to 7.0rc1 (#139)

Bumps [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions) from 7.0b2 to 7.0rc1.
- [Release notes](https://github.com/facelessuser/pymdown-extensions/releases)
- [Commits](https://github.com/facelessuser/pymdown-extensions/compare/7.0.0b2...7.0.0rc1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Pipfile.lock

@@ -727,11 +727,11 @@
         },
         "pymdown-extensions": {
             "hashes": [
-                "sha256:18dd66363205c1b047e2b76fba14a839cc7ce12b48970bd8bccaa2033cbeb2da",
-                "sha256:9aeb3224a25fa24f6fd8d822243d03fd0a41a082f0f5eb6d90649d93f43bd7cb"
+                "sha256:48b21fcf1fbeb0a1ea57c26b0dcc246f3f919e72443bccc5aae914f81cbf4909",
+                "sha256:a11ebdc5c800ea350744eadaca853fab6c086edefba8df767dfb58e97de0653e"
             ],
             "index": "pypi",
-            "version": "==7.0b2"
+            "version": "==7.0rc1"
         },
         "pyparsing": {
             "hashes": [