chore(package): update markdown-magic to version 0.1.21

Closes #16

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "fixpack": "2.3.1",
     "jest": "21.2.1",
     "jest-cli": "21.2.1",
-    "markdown-magic": "0.1.19",
+    "markdown-magic": "0.1.21",
     "markdown-magic-dependency-table": "1.3.2",
     "markdown-magic-install-command": "1.3.1",
     "markdown-magic-package-scripts": "1.2.1",