Install go-sqlite3 still require gcc

[kpvt001]

I used

go install github.com/mattn/go-sqlite3

still notice gcc not found

[mattn]

dup #175 or #315 or #212

[rdslw]

@mattn You seems to have constant flow of bugs like this.

I think I found the root cause: it's bad wording on readme.md which confuses users. I forsure was confused :) and saw many others. If I may suggest you should replace paragraph stating:

go-sqlite3 is cgo package. If you want to build your app using go-sqlite3, you need gcc. However, if you install go-sqlite3 with go install github.com/mattn/go-sqlite3, you don't need gcc to build your app anymore.

to this one:

go-sqlite3 is cgo package. If you want to build your app using go-sqlite3, you need gcc. You may uninstall gcc after first time compilation after installing go-sqlite3.a into gopath. You can compile and install go-sqlite3 with command: go install github.com/mattn/go-sqlite3. This means you still need gcc for the initial build, but you can uninstall it afterwards.

[mattn]

Could you please send pull-request?