Change tense of hook descriptions

With parallelized hook runs, displaying "Running..." after the hook has
run doesn't really make sense.

Switch to present tense. While past tense might make more sense here,
present reads fine and takes up less space (i.e. there is no "...ed"
tacked on to every verb). It also makes more sense to read in the YAML
configuration.

I still think there will come a time where Overcommit provides better
output during parallelized runs (i.e. showing live progress), but I'm
content that this is "good enough" for now.

Author: sds

CHANGELOG.md

@@ -13,6 +13,9 @@
   a regex pattern
 * Switch `ScssLint` pre-commit hook to use the JSON output formatter instead
   of the default formatter
+* Change tense of hook descriptions from progressive indicative form ("Running")
+  to indicative present form ("Run") so output reads better in parallel hook
+  runs
 
 ## 0.32.0.rc1