Bug 1571326 - Update to apilint 0.2.5. r=droeh

Before this version, apilint would not include CHANGELOG errors in the json
report. After Bug 1512487 we started ignoring apilint output (and erorr code)
and only consider the json report, so the CHANGELOG erorrs broke.

Updating to 0.2.5 makes it so the CHANGELOG errors are included in the json
report correctly. E.g.:

```
mobile/android/geckoview/src/main/java/org/mozilla/geckoview/doc-files/CHANGELOG.md
  384:14  error  The api changelog file is out of date. Please update the file
          and modify the [api-version] line as follows: [api-version]:
          a0b1e88e8bb3045a22c0942d736f4e9b4532bdeb  wrong_api_version
          (android-api-lint)
```

The apilint fix is here:
mozilla-mobile/gradle-apilint@9cadbd0

Differential Revision: https://phabricator.services.mozilla.com/D40655

--HG--
extra : moz-landing-system : lando

build.gradle

@@ -83,7 +83,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'org.mozilla.apilint:apilint:0.2.4'
+        classpath 'org.mozilla.apilint:apilint:0.2.5'
         classpath 'com.android.tools.build:gradle:3.4.2'
         classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.8.2'
         classpath 'org.apache.commons:commons-exec:1.3'