How to avoid deprecation notice for libraies supporting multi-version of Nim?

[jackhftang]

For example, I have an old code like this
    
    
    initTable[K,V](rightSize(capacity))
    
    
    Run

Since `rightSize` is deprecated in 1.4.0, I modify the code to the following
    
    
    when (1,0) <= (NimMajor, NimMinor) and (NimMajor, NimMinor) < (1,4):
      initTable[K,V](rightSize(capacity))
    else:
      initTable[K,V](capacity)
    
    
    Run

However, compiler is still saying `Warning: Deprecated since 1.4.0; rightSize 
is deprecated` on the second line.

This code is part of a library and I want the code still being able to run on 
before Nim 1.4 **without warning**. Users are not happy with warning =)

I am aware that `initTable[K,V]()` can be used in this case, but this is not 
**general** solution to support multi-version of Nim.