Update README

Author: guizmaii

README.md

@@ -25,7 +25,7 @@ In your `Jarfile`:
 ```ruby
 source 'https://dl.bintray.com/colisweb/maven'
 
-jar 'com.colisweb:JRubyConcurrentConstantMemoryExcel_2.12', '1.0.3'
+jar 'com.colisweb:JRubyConcurrentConstantMemoryExcel_2.12', '1.0.4'
 ```
 
 Usage