chore: update readme and bump version

Cargo.toml

@@ -1,9 +1,9 @@
 [package]
 name = "json_env"
-version = "1.2.1"
+version = "1.3.0"
 edition = "2021"
 license = "Apache-2.0"
-description ="Loads an environment variables from a JSON file (`.env.json` per default) and starts a subprocess with them."
+description ="Loads an environment variables from  JSON files (`.env.json` per default) and starts a subprocess with them."
 homepage = "https://github.com/brodo/json_env"
 repository = "https://github.com/brodo/json_env.git"
 readme = "Readme.md"

Readme.md

@@ -1,5 +1,10 @@
 # json_env
 
+> **Environment Variable Loader** 
+
+[![npmjs.com](https://img.shields.io/npm/v/@brodo/json_env?)](https://www.npmjs.com/package/@brodo/json_env)
+[![Crates.io](https://img.shields.io/crates/v/json_env)](https://crates.io/crates/json_env) [![License](https://img.shields.io/badge/license-Apache%202.0-blue)](LICENSE)
+
 `json_env` is [dotenv](https://github.com/motdotla/dotenv), but with JSON.
 It loads an environment variables from a JSON file (`.env.json` per default) and starts a subprocess with them. 
 Storing configuration in the environment separate from code is based on [The Twelve-Factor](http://12factor.net/config) App methodology.
@@ -146,6 +151,7 @@ my_settings.json
   "PASSWORD": "hunter2"
 }
 ```
+Use multiple `-c` flags to add several config files:
 
 ```shell
 $ json_env -c defaults.json -c my_settings.json env