Remove hardcoded version from source code

[h00s]

Issue Description

Release version is hardcoded in echo.go file. Version 3.2.4 is released, but hardcoded version 3.2.3 is still written in echo.go file. When starting server it displays old version, but is actually running newer version. This confuses users...

Expected behaviour

Server on start should display actual release version.

Actual behaviour

Server displays version hardcoded in echo.go file which is set or is not set to actual release version.

Version/commit

3.2.4

[vishr]

Fixed in 0473c51