ErrorActivity: add Timestamp and Package/Service to markdown export

These were displayed in the UI, but not added into the markdown export
string.

Author: Profpatsch

app/src/main/java/org/schabi/newpipe/error/ErrorActivity.java

@@ -248,6 +248,9 @@ private String buildMarkdown() {
                     .append("\n* __Content Language:__ ").append(getContentLanguageString())
                     .append("\n* __App Language:__ ").append(getAppLanguage())
                     .append("\n* __Service:__ ").append(errorInfo.getServiceName())
+                    .append("\n* __Timestamp:__ ").append(currentTimeStamp)
+                    .append("\n* __Package:__ ").append(getPackageName())
+                    .append("\n* __Service:__ ").append(errorInfo.getServiceName())
                     .append("\n* __Version:__ ").append(BuildConfig.VERSION_NAME)
                     .append("\n* __OS:__ ").append(getOsString()).append("\n");