I just received an email after more than 3 months of waiting! 
 It was tough to wait every day! 
  
I got it as a spouse and now I want to apply for citizenship immediately as I have been here for more than 5 years. I read somewhere that I have to wait for one year after getting ILR in order to apply for citizenship, does that rule apply to spouse ILR too?
Congratulations 

!
As you are married to a UK citizen, you do not have to wait to apply for citizenship. And you only have to show 3 years of UK residency.
So, you can apply as soon as you have your ILR BRP card.
If you were not married to a UK citizen, you would have to wait to apply for citizenship until you had held ILR for 12 months, and you would have to show 5 years of residency. 
Sent from my iPhone using Tapatalk