lint: GradleDependency as warning

Not all available updates are showstoppers:

../../build.gradle:78: A newer version of androidx.test:runner than 1.3.0 is available: 1.4.0
../../build.gradle:79: A newer version of androidx.test.ext:junit than 1.1.2 is available: 1.1.3

download/build.gradle

@@ -107,7 +107,14 @@ android {
         targetCompatibility JavaVersion.VERSION_1_8
     }
     lintOptions {
-        disable "InvalidPackage"
+        checkReleaseBuilds false
+        abortOnError true
+
+        htmlReport true
+        xmlReport false
+        textReport true
+
+        lintConfig file("lint.xml")
     }
 }
 

download/lint.xml

@@ -2,4 +2,6 @@
 <lint>
     <!-- TODO bump our targetSdkVersion when we are ready for it -->
     <issue id="ExpiredTargetSdkVersion" severity="ignore"/>
-</lint>
+    <issue id="GradleDependency" severity="warning"/>
+    <issue id="InvalidPackage" severity="ignore"/>
+</lint>