Fix greedy match of version number

The original regex will greedily match the first digit of version
numbers that have multiple digits.

bin/git-release

@@ -58,7 +58,7 @@ if test $# -gt 0; then
     latest_tag=$(git describe --tags "$(git rev-list --tags --max-count=1)")
 
     if [[ ! "$latest_tag" =~ \
-        ^([^0-9]*)([0-9]|[1-9][0-9]+)\.([0-9]|[1-9][0-9]+)\.([0-9]|[1-9][0-9]+)(.*) ]]; then
+        ^([^0-9]*)([1-9][0-9]+|[0-9])\.([1-9][0-9]+|[0-9])\.([1-9][0-9]+|[0-9])(.*) ]]; then
       echo "the latest tag doesn't match semver format requirement" 1>&2
       exit 1
     fi