Update documentation for v0.8.1.2 (#238)

* Update `publish.gradle` for v8.1.1.2
* Update `README.md` for v8.1.1.2
* Update `PREREQUISITE.md` for v8.1.1.2

Author: designe

PREREQUISITE.md

@@ -36,13 +36,13 @@ There are 3 ways adding euphony to your project.
 dependencies {
 	// other dependencies
 	// ...
-	implementation 'co.euphony.lib:euphony:0.8.1.1'
+	implementation 'co.euphony.lib:euphony:0.8.1.2'
 }
 ```
 
 ### 1.2 Import the aar/jar file directly
 
-1. Download `euphony.aar` : [MavenCentral euphony artifact](https://search.maven.org/artifact/co.euphony.lib/euphony/0.8.1.1/aar) follow the link and download aar file.
+1. Download `euphony.aar` : [MavenCentral euphony artifact](https://search.maven.org/artifact/co.euphony.lib/euphony/0.8.1.2/aar) follow the link and download aar file.
 2. Put `euphony.aar` file in `libs` folder.
 
 <img width="392" alt="aar_002_auto_x2_colored_toned" src="https://user-images.githubusercontent.com/27720475/130187177-b97b55ef-158a-4975-b0f8-b9e8bfdc5886.png">
@@ -57,7 +57,7 @@ repositories {
 }
 
 dependencies {
-    implementation name: 'euphony-0.8.1.1', ext: 'aar'
+    implementation name: 'euphony-0.8.1.2', ext: 'aar'
 }
 
 ```

README.md

@@ -15,7 +15,7 @@ Euphony provides a handiness library designed to communicate with other devices(
 1) build.gradle in app module
 ```gradle
 dependencies {
-    implementation 'co.euphony.lib:euphony:0.8.1.1'
+    implementation 'co.euphony.lib:euphony:0.8.1.2'
 }
 ```
 

euphony/publish.gradle

@@ -3,7 +3,7 @@ apply plugin: 'signing'
 
 def LIB_GROUP_ID = 'co.euphony.lib'
 def LIB_ARTIFACT_ID = 'euphony'
-def LIB_VERSION = '0.8.1.1'
+def LIB_VERSION = '0.8.1.2'
 
 task androidSourcesJar(type: Jar) {
     archiveClassifier.set('sources')