docs(README): adjust README reconnectOnError code sample (#1089)
docs(README): adjust README reconnectOnError code sample (#1089)

The existing README code sample checks for an error message that begins
with the string READONLY however if the error is produced from a lua
script the condition would not match it. A lua script READONLY error
looks like this:

ERR Error running script (call to
f_45e87c07f6aff394093b73766a458691d0460655): @user_script:1:
@user_script: 1: -READONLY You can't write against a read only replica.

This changes the sample to instead check for READONLY as a substring
luin/ioredis,luin/ioredis,luin/ioredis