README.md in embulk-input-athena-0.1.2 vs README.md in embulk-input-athena-0.1.4

@@ -1,7 +1,10 @@
 # Athena input plugin for Embulk
 
+[![Gem Version](https://badge.fury.io/rb/embulk-input-athena.svg)](https://badge.fury.io/rb/embulk-input-athena)
+[![MIT License](http://img.shields.io/badge/license-MIT-blue.svg?style=flat)](LICENSE)
+
 Athena input plugin for Embulk loads records from Athena(AWS).
 
 ## Overview
 
 * **Plugin type**: input
@@ -10,18 +13,19 @@
 * **Guess supported**: no
 
 ## Configuration
 
 * **driver_path**: path to the jar file of the Athena JDBC driver. If not set, the bundled JDBC driver(AthenaJDBC41-1.1.0.jar) will be used. (string)
-* **database**: description (string, required)
-* **athena_url**: description (string, required)
+* **database**: database name (string, required)
+* **athena_url**: Athena url (string, required)
 * **s3_staging_dir**: The S3 location to which your query output is written, for example s3://query-results-bucket/folder/. (string, required)
-* **access_key**: description (string, required)
-* **secret_key**: description (string, required)
-* **query**: description (string, required)
-* **columns**: description (string, required)
-* **options**: description (string, default: {})
+* **access_key**: AWS access key (string, required)
+* **secret_key**: AWS secret key (string, required)
+* **query**: SQL to run (string, required)
+* **columns**: columns (string, required)
+* **options**: extra JDBC properties (string, default: {})
+* **null_to_zero**: if true, convert long, double and boolean value from null to zero (boolean, default: false)
 
 ## Example
 
 ```yaml
 in:
@@ -34,9 +38,10 @@
   query: |
     select uid, created_at from log_test.sample
   columns:
     - {name: uid, type: string}
     - {name: created_at, type: timestamp}
+  null_to_zero: true
 ```
 
 ## Build
 
 ```bash