Bumped v4.1.5

Signed-off-by: Vishal Rana <vr@labstack.com>

Fixed group middleware

Signed-off-by: Vishal Rana <vr@labstack.com>

Fixed invalid json value for error in logger middleware

Signed-off-by: Vishal Rana <vr@labstack.com>

Fixed sub-group virtual hosts

Added a method to return routers map

Signed-off-by: Vishal Rana <vr@labstack.com>

Bumped 4.1.0

Signed-off-by: Vishal Rana <vr@labstack.com>

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 <vr@labstack.com>