Update to not need to specify build tools

Author: Jawnnypoo

.travis.yml

@@ -7,7 +7,10 @@ android:
   components:
     - platform-tools
     - tools
-    - build-tools-26.0.1
-    - android-26
+
+before_script:
+  # Install SDK license so Android Gradle plugin can install deps.
+  - mkdir "$ANDROID_HOME/licenses" || true
+  - echo "8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
 
 script: "./gradlew build"

adapterflowlayout/build.gradle

@@ -2,7 +2,6 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion rootProject.ext.minSdkVersion

adapterlayout-kotlin/build.gradle

@@ -3,7 +3,6 @@ apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion rootProject.ext.minSdkVersion

adapterlayout/build.gradle

@@ -2,7 +2,6 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion rootProject.ext.minSdkVersion

app/build.gradle

@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         applicationId "com.commit451.adapterlayout.sample"

build.gradle

@@ -7,7 +7,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0-beta6'
+        classpath 'com.android.tools.build:gradle:3.0.0-beta7'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.15.0'
@@ -32,6 +32,5 @@ ext {
     minSdkVersion = 15
     compileSdkVersion = 26
     targetSdkVersion = compileSdkVersion
-    buildToolsVersion = '26.0.1'
     supportLibVersion = '26.1.0'
 }