Introduced Go module support as v4, removed obsolete CloseNotifier() …

…mechanism

This reintroduces support for Go modules, as v4.

CloseNotifier() is removed as it has been obsoleted, see https://golang.org/doc/go1.11#net/http

It was already NOT working (not sending signals) as of 1.11 the functionality was gone, we merely
deleted the functions that exposed it. If anyone still relies on it they should migrate to using
`c.Request().Context().Done()` instead.

Closes labstack#1268, labstack#1255

Removed go.mod and sum to help solve the issue with Go modules (labst…

…ack#1244)

Bumped up version to 3.3.9 (related to labstack#1244)

Bumbed version

Signed-off-by: Vishal Rana <[email protected]>

Added user-agent to logger middleware

Signed-off-by: Vishal Rana <[email protected]>

Updated version

Signed-off-by: Vishal Rana <[email protected]>

Add back exported HTTP method constants (labstack#1209)

Update dependencies (labstack#1194)

* Update go.mod

Replace:
`github.com/labstack/gommon v0.0.0-20180312174116-6fe1405d73ec`
With:
`github.com/labstack/gommon v0.2.7`

* Update Gopkg

Replace:
`github.com/labstack/gommon 0.2.4`
With:
`github.com/labstack/gommon v0.2.7`

* Update go/dep 0.5.0

Updated deps

Signed-off-by: Vishal Rana <[email protected]>

Update README.md