Update release date in README.md
Update release date in README.md

spuentesp/JB4A-SDK-CordovaPlugin,spuentesp/JB4A-SDK-CordovaPlugin,pentateu/JB4A-SDK-AppGyverPlugin,spuentesp/JB4A-SDK-CordovaPlugin,pentateu/JB4A-SDK-AppGyverPlugin