[aar-instrumented-tester] Fix couple of typos/errors. Update target aar version.

Author: ViliusSutkus89

aar-instrumented-tester/README.md

@@ -17,7 +17,7 @@ implementation 'com.viliussutkus89:pdf2htmlex-android:0.18.3'
 Local .aar file can be used to, but it needs a complete list of dependencies
 ```Groovy
 ...
-files('libs/pdf2htmlex-android-release.aar')
+implementation files('libs/pdf2htmlex-android-release.aar')
 implementation 'com.viliussutkus89:tmpfile-android:1.0.2'
 ...
 ```

aar-instrumented-tester/pdf2htmlEX/build.gradle

@@ -22,10 +22,10 @@ dependencies {
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 
 //    Either depend on local .aar (and all it's dependencies)
-//    files('libs/pdf2htmlex-android-release.aar')
+//    implementation files('libs/pdf2htmlex-android-release.aar')
 //    implementation 'com.viliussutkus89:tmpfile-android:1.0.2'
 
 //    Or a released version in Bintray
-    implementation 'com.viliussutkus89:pdf2htmlex-android:0.18.3'
+    implementation 'com.viliussutkus89:pdf2htmlex-android:0.18.4'
 }
 

pdf2htmlEX/src/androidTest/java/com/viliussutkus89/android/pdf2htmlex/InstrumentedTests.java

@@ -43,7 +43,7 @@
 @RunWith(AndroidJUnit4.class)
 public class InstrumentedTests {
 
-  // PDFs must be places in pdf2htmlEX/src/androidTest/assets/
+  // PDFs must be placed in pdf2htmlEX/src/androidTest/assets/
   private final String[] m_PDFsToTest = new String[] {
           "fontfile3_opentype.pdf",
           "basic_text.pdf",