Mac readline - Library not loaded

I was able to resolve this by simply running brew switch readline 6.3.8

Running brew upgrade gawk worked for me, as suggested by @wisbucky

And that fixed the below error, upon opening a new terminal :

dyld: Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib
  Referenced from: /usr/local/bin/awk

OS details: macOS Mojave version 10.14.1 (18B75)

my issue was due to my awk being linked to gawk

brew unlink gawk