Android bump minversion to 26

Author: rsahlin

graphics-by-opengl-android/build.gradle

@@ -33,7 +33,7 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 24
+        minSdkVersion 26
         targetSdkVersion 29
         versionCode 1
         versionName "1"
@@ -53,4 +53,4 @@ dependencies {
     implementation 'com.android.support:multidex:1.0.2'
     testImplementation 'junit:junit:4.12'
     testImplementation "org.mockito:mockito-core:2.+"
-}
+}