Fix license header check script

Author: gjcairo

dev/license-check.sh

@@ -88,7 +88,7 @@ check_copyright_headers() {
 
     actual_sha=$(head -n "$((drop_first + expected_lines))" "$filename" \
       | tail -n "$expected_lines" \
-      | sed -e 's/201[56789]-20[12][0-9]/YEARS/' -e 's/20[12][0-9]/YEARS/' \
+      | sed -e 's/20[12][0-9]-20[12][0-9]/YEARS/' -e 's/20[12][0-9]/YEARS/' \
       | shasum \
       | awk '{print $1}')