Meta: Fix regex version check in the lint-prettier script

If your local version is 3.2.0, this check would errantly pass.

Meta/lint-prettier.sh

@@ -30,7 +30,7 @@ if (( ${#files[@]} )); then
         exit 1
     fi
 
-    if ! prettier --version | grep -qF '2.' ; then
+    if ! prettier --version | grep -q '\b2\.' ; then
         echo "You are using '$(prettier --version)', which appears to not be prettier 2."
         exit 1
     fi