The government of India waived penalty on delayed filing of initial GST returns for the months of August and September.
“To facilitate taxpayers, late fee on filing of GSTR-3B for August and September has been has been waived,” Finance Minister Arun Jaitley said on tweeted.

Press Release on waiver of late fee on filing of GSTR-3B for August and September, 2017
From the GST Tweets:

लघु एवं मध्यम उद्यमों (एसएमई) के लिए राहत पैकेज । माल और सेवा कर – अच्छा हैं सरल हैं
from the council meeting. Check more at GST FAQ.