update commons and kotlin

app/build.gradle

@@ -32,12 +32,12 @@ android {
 }
 
 dependencies {
-    compile 'com.simplemobiletools:commons:2.17.2'
+    compile 'com.simplemobiletools:commons:2.20.1'
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 }
 
 buildscript {
-    ext.kotlin_version = '1.1.2-3'
+    ext.kotlin_version = '1.1.2-5'
     repositories {
         mavenCentral()
     }

app/src/main/kotlin/com/simplemobiletools/camera/Preview.kt

@@ -298,7 +298,7 @@ class Preview : ViewGroup, SurfaceHolder.Callback, MediaScannerConnection.OnScan
         if (config.isShowPreviewEnabled) {
             mIsPreviewShown = true
             if (!config.wasPhotoPreviewHintShown) {
-                context.toast(R.string.click_to_resume_preview)
+                mActivity.toast(R.string.click_to_resume_preview)
                 config.wasPhotoPreviewHintShown = true
             }
         } else {