Fix release build issue.

Author: IvBaranov

README.md

@@ -352,7 +352,7 @@ Download
 --------
 Releases are available both in `jcenter` and `mavenCentral` repositories.
 ```groovy
-compile 'com.github.ivbaranov:rxbluetooth2:2.0.4'
+compile 'com.github.ivbaranov:rxbluetooth2:2.1.0'
 ```
 
 #### Snapshots

gradle.properties

@@ -20,8 +20,8 @@ ANDROIDX_ANNOTATION_VERSION=1.0.1
 ANDROIDX_APPCOMPAT_VERSION=1.0.0
 
 # Dependency versions (plugins)
-GRADLE_PLUGIN_VERSION=3.2.1
-BINTRAY_RELEASE=0.8.1
+GRADLE_PLUGIN_VERSION=3.3.0
+BINTRAY_RELEASE=0.9
 
 # Maven
 USER_ORG=ivbaranov

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists