Cookie file parsing doesn't ignore trailing whitespace / newlines

[Randy808]

When testing this out I was getting an error because of a trailing newline in my .cookie file

[Psifour]

Is there are standard situation where you can encounter whitespace on that line?

The relevant location to fix this is upstream on https://github.com/casey/rust-bitcoincore-rpc/blob/9e6dff79fadd6ae472e51165b0064ebed97aad95/client/src/client.rs#L213 A simple trim() would resolve this if the cause is something that is likely to be a recurring problem with users.

[Randy808]

Yes, when making a .cookie file due to lack of support for #1399 (because I imagine most people have a configured bitcoin.conf). I imagine this will be a recurring problem until there's support for rpc_user and rpc_pass so it may be worth adding