fix path conflict

[wusphinx]

It will be panic with gin(v1.1.5-0.20170702092826-d459835d2b07) as below

[GIN-debug] GET    /ping                     --> main.main.func1 (3 handlers)
[GIN-debug] GET    /ping/:id                 --> main.m (3 handlers)
[GIN-debug] GET    /ping/pong/:id            --> main.m (3 handlers)
panic: path segment 'pong/:id' conflicts with existing wildcard ':id' in path '/ping/pong/:id'

so when I config in lura with gin as below

		{
			"endpoint": "/ping/{param1}",
			"output_encoding": "no-op",

			"backend": [{
				"encoding": "no-op",

				"host": [
					"http://127.0.0.1:1234"
				],
				"url_pattern": "/ping/{param1}"
			}]
		},
		{
			"endpoint": "/ping/pong/{param1}",
			"output_encoding": "no-op",

			"backend": [{
				"encoding": "no-op",

				"host": [
					"http://127.0.0.1:1234"
				],
				"url_pattern": "/ping/pong/{param1}"
			}]
		}

I will get the same panic, so, I just upgrade gin to lastest version.
We can get a few clues with this issue and PR. Actuall, the problem has been fixed in Gin，but, we can't get the client ip correctly, becasue as below

func (engine *Engine) Run(addr ...string) (err error) {
	defer func() { debugPrintError(err) }()

	trustedCIDRs, err := engine.prepareTrustedCIDRs()
	if err != nil {
		return err
	}
	engine.trustedCIDRs = trustedCIDRs
	address := resolveAddress(addr)
	debugPrint("Listening and serving HTTP on %s\n", address)
	err = http.ListenAndServe(address, engine)
	return
}

lura doesn't set the trustedCIDRs with gin, so, I just use the function mux.ClientIP instead, and it does work!

[kpacha]

will be fixed at #524

[wusphinx]

will be fixed at #524

Looking forward to the official release of v2.0.0

[github-actions]

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