feat: use "package" instead of "packaging"

I haven't seen "packaging" used that much in the wild,
while "package" is something very common (for example: GreenKeeper).
This commit updates the examples to use the latter, so repositories
with GreenKeeper are kept consistent.

Author: blackxored

examples/commitlint-patterns.json

@@ -3,7 +3,7 @@
     "system": [
       "build",
       "deps",
-      "packaging",
+      "package",
       "release"
     ],
     "packages": [