Upgrade sdk to v1.0.8.1 2019-01-11

reader/build.gradle

@@ -46,5 +46,5 @@ dependencies {
 
     testImplementation 'junit:junit:4.12'
 
-    api(name: 'kmpdfkit-1.0.8.1', ext: 'aar')
+    api(name: 'kmpdfkit-1.0.8.1 2019-01-11', ext: 'aar')
 }