Update README.md and application to match versions with to be released library version (0.18.15)

Author: ViliusSutkus89

README.md

@@ -23,7 +23,7 @@ Sample application consumes under 30MB.
 [application/app/build.gradle](application/app/build.gradle) contains code to load the library as a dependency in Gradle.
 ```gradle
 dependencies {
-    implementation 'com.viliussutkus89:pdf2htmlex-android:0.18.14'
+    implementation 'com.viliussutkus89:pdf2htmlex-android:0.18.15'
 }
 ```
 

application/app/build.gradle

@@ -10,8 +10,8 @@ android {
         applicationId "com.viliussutkus89.android.pdf2htmlex.application"
         minSdkVersion 16
         targetSdkVersion 32
-        versionCode 28
-        versionName '0.18.14.3'
+        versionCode 125
+        versionName '0.18.15.3'
     }
     splits {
         abi {
@@ -43,7 +43,7 @@ android {
 }
 
 dependencies {
-    implementation 'com.viliussutkus89:pdf2htmlex-android:0.18.14'
+    implementation 'com.viliussutkus89:pdf2htmlex-android:0.18.15'
 
     implementation 'androidx.appcompat:appcompat:1.4.0'
     implementation 'androidx.activity:activity:1.4.0'