Merge branch 'master' into develop

# Conflicts:
#	README.md
#	app/build.gradle
#	build.gradle

README.md

@@ -1,8 +1,5 @@
 # NumberPickerPreference
-[![API](https://img.shields.io/badge/API-19%2B-brightgreen.svg?style=flat)](https://android-arsenal.com/api?level=19) 
-[![](https://jitpack.io/v/invissvenska/NumberPickerPreference.svg)](https://jitpack.io/#invissvenska/NumberPickerPreference)  
-<a href="https://github.com/invissvenska/NumberPickerPreference/actions"><img alt="Build Status" src="https://github.com/invissvenska/NumberPickerPreference/workflows/Android-Library%20CI/badge.svg"/></a> 
-<span class="badge-buymeacoffee"><a href="https://www.paypal.com/paypalme/svenvandentweel/3" title="Donate to this project using Buy Me A Coffee"><img src="https://img.shields.io/badge/buy%20me%20a%20coffee-donate-yellow.svg" alt="Buy Me A Coffee donate button" /></a></span> 
+[![API](https://img.shields.io/badge/API-19%2B-brightgreen.svg?style=flat)](https://android-arsenal.com/api?level=19) [![](https://jitpack.io/v/invissvenska/NumberPickerPreference.svg)](https://jitpack.io/#invissvenska/NumberPickerPreference) <a href="https://github.com/invissvenska/NumberPickerPreference/actions"><img alt="Build Status" src="https://github.com/invissvenska/NumberPickerPreference/workflows/Android-Library%20CI/badge.svg"/></a> <span class="badge-buymeacoffee"><a href="https://www.paypal.com/paypalme/svenvandentweel/3" title="Donate to this project using Buy Me A Coffee"><img src="https://img.shields.io/badge/buy%20me%20a%20coffee-donate-yellow.svg" alt="Buy Me A Coffee donate button" /></a></span>  
 
 ## Prerequisites
 
@@ -30,19 +27,19 @@ dependencies {
 
 ## Configuration
 
-Add the NumberDialogPreference to the preferences.xml:
+Add the NumberDialogPreference to the `preferences.xml`:
 
 ```xml
 <nl.invissvenska.numberpickerpreference.NumberDialogPreference
     android:key="preference_key"
     android:title="Preference title"
-    app:defaultValue="20" // optional, default is 0
-    app:numberPickerPreference_minValue="10" // optional, default is 0
-    app:numberPickerPreference_maxValue="60" // optional, default is 100
-    app:numberPickerPreference_stepValue="1" // optional, default is 1
-    app:numberPickerPreference_unitText=" another quantity" /> // optional, default is ""
+    app:numberPickerPreference_minValue="10"
+    app:numberPickerPreference_maxValue="60"
+    app:numberPickerPreference_unitText=" another quantity" /> 
 ```
 
+## Usage
+
 Override the OnDisplayPreferenceDialog method in your fragment which extends the PreferenceFragmentCompat class:
 ```java
 public class SettingsFragment extends PreferenceFragmentCompat {
@@ -72,8 +69,6 @@ public class SettingsFragment extends PreferenceFragmentCompat {
 }
 ```
 
-## Usage
-
 To create a NumberPickerPreference with default value of 20, min value of 10, max value of 60, increments of 2 and custom unit text:
 ```xml
 <nl.invissvenska.numberpickerpreference.NumberDialogPreference
@@ -86,6 +81,15 @@ To create a NumberPickerPreference with default value of 20, min value of 10, ma
     app:numberPickerPreference_unitText=" another quantity" />
 ```
 
+## NumberDialogPreference Attributes
+Attributes | Type | Default | Mandatory | Description
+--- | --- | --- | --- | ---
+defaultValue | Integer | 0 | No | Sets the default value of the preference.
+numberPickerPreference_minValue | Integer | 0 | No | Minimum value to select from preference.
+numberPickerPreference_maxValue | Integer | 100 | No | Maximum value to select from preference.
+numberPickerPreference_stepValue | Integer | 1 | No | Stepper value, minimum value should be 1.
+numberPickerPreference_unitText | String | none | No | Suffix value, can be used to indicate the unit which will be selected.
+
 ## Screenshots
 
 **Please click the image below to enlarge.**