Revised return of ay 2017-18 -filling date

My company filed income tax return of AY 2017-18 on due date under 139(1) and so is eligilbe to file revised return u/s 139(5). 

Some one told me that revised return of 2017-18 can be filed up to 31.03.2018 only and not after this date.

Is this correct or i can file revised return up to 31.03.2019 as usual u/s 139(5). Has section 139(5) been amended w.r.t. last date of filling revised return?

please guide