Strip obsolete dependencies (#8)

mdpopups vendors all libraries it needs, so all others can be removed.

dependencies.json

@@ -1,13 +1,7 @@
 {
-  "*": {
-    ">=3114": [
-      "markupsafe",
-      "mdpopups",
-      "pygments",
-      "pymdownx",
-      "python-jinja2",
-      "python-markdown",
-      "pyyaml"
-    ]
-  }
+	"*": {
+		">=3114": [
+			"mdpopups"
+		]
+	}
 }

utils/info.py

@@ -56,24 +56,6 @@ def run(self):
         except Exception:
             info["mdpopups_version"] = 'Version could not be acquired!'
 
-        try:
-            import markdown
-            info["markdown_version"] = format_version(markdown, 'version')
-        except Exception:
-            info["markdown_version"] = 'Version could not be acquired!'
-
-        try:
-            import jinja2
-            info["jinja_version"] = format_version(jinja2, '__version__')
-        except Exception:
-            info["jinja_version"] = 'Version could not be acquired!'
-
-        try:
-            import pygments
-            info["pygments_version"] = format_version(pygments, '__version__')
-        except Exception:
-            info["pygments_version"] = 'Version could not be acquired!'
-
         msg = textwrap.dedent(
             """\
             - Sublime Text:   %(version)s
@@ -83,9 +65,6 @@ def run(self):
             - Install via PC:   %(pc_install)s
             - Dependencies:
                 * mdpopups:   %(mdpopups_version)s
-                * markdown:   %(markdown_version)s
-                * pygments:   %(pygments_version)s
-                * jinja2:   %(jinja_version)s
             """ % info
         )