[New] add `nvm -v` as an alias for `nvm --version`

Fixes #2200.
diff --git a/nvm.sh b/nvm.sh
index ce142f9..7f77000 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -3580,7 +3580,7 @@
       esac
       NVM_VERSION_ONLY=true NVM_LTS="${NVM_LTS-}" nvm_remote_version "${PATTERN:-node}"
     ;;
-    "--version")
+    "--version" | "-v")
       nvm_echo '0.35.3'
     ;;
     "unload")