Update install instructions from to `go install`

Looks like `go get` has been deprecated.

New method for installation is `go install <repo-url>@latest`

In this case:

```sh
go install github.com/qeesung/image2ascii@latest
```

Add Awesome badge

Fixed the high cyclomatic complexity issue

Fixed the golint issue

Fixed the golint issue

Disable deploy

Refactor rename the PixelASCII to CharPixel

fixed the go lint issue

Add method to support convert image to pixelASCII matrix

remove useless code

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

add some examples

update docker image

update the logic

fixed the lint issue

reformat the code