OboeTester: update gradle and build settings
diff --git a/apps/OboeTester/app/src/main/AndroidManifest.xml b/apps/OboeTester/app/src/main/AndroidManifest.xml
index 3e0f75c..2465afa 100644
--- a/apps/OboeTester/app/src/main/AndroidManifest.xml
+++ b/apps/OboeTester/app/src/main/AndroidManifest.xml
@@ -5,10 +5,6 @@
     android:versionName="1.2.01">
     <!-- versionCode and versionName also have to be updated in build.gradle -->
 
-    <uses-sdk
-        android:minSdkVersion="24"
-        android:targetSdkVersion="24" />
-
     <uses-feature android:name="android.hardware.microphone" android:required="true" />
     <uses-feature android:name="android.hardware.audio.output" android:required="true" />
     <uses-feature android:name="android.software.midi" android:required="true" />
diff --git a/apps/OboeTester/build.gradle b/apps/OboeTester/build.gradle
index 8054476..c78c3f9 100644
--- a/apps/OboeTester/build.gradle
+++ b/apps/OboeTester/build.gradle
@@ -6,7 +6,7 @@
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.4'
+        classpath 'com.android.tools.build:gradle:3.2.1'
     }
 }
 
diff --git a/apps/OboeTester/gradle/wrapper/gradle-wrapper.properties b/apps/OboeTester/gradle/wrapper/gradle-wrapper.properties
index 797dc65..876c713 100644
--- a/apps/OboeTester/gradle/wrapper/gradle-wrapper.properties
+++ b/apps/OboeTester/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Sep 18 10:50:16 PDT 2018
+#Thu Nov 29 10:59:51 PST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip