Cleaning and improving log sentences.

[SMSadegh19]

Hi! I was searching about Good-First-Issues in Go language, so I found this repo.

I tried to read the source code and I was thinking that what can I do.

I saw in the source code most of log sentences start with Uppercase alphabet, But few of them start with lowercase. So I made it clean and made this PR with Love.❤️

If any other Good-First-Issue you have in this repository please tell me. Thanks a lot!