Update github.com/maybebtc/logrus dependency

This patch was generated by running:

$ godep update github.com/maybebtc/logrus

Without this, `godep restore` fails like this:

```
$ LANG=C godep restore
fatal: reference is not a tree: 005463f8fb49c4a6f36181e05157e111ec5cf8a3
godep: restore: exit status 128
```

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

Godeps/Godeps.json

@@ -133,8 +133,8 @@
 		},
 		{
 			"ImportPath": "github.com/maybebtc/logrus",
-			"Comment": "v0.6.0-6-g005463f",
-			"Rev": "005463f8fb49c4a6f36181e05157e111ec5cf8a3"
+			"Comment": "v0.6.0-5-gf92b795",
+			"Rev": "f92b7950b372b1db80bd3527e4d40e42555fe6c2"
 		},
 		{
 			"ImportPath": "github.com/mitchellh/go-homedir",

Godeps/_workspace/src/github.com/maybebtc/logrus/polite_json_formatter.go

@@ -1,16 +0,0 @@
-package logrus
-
-import (
-	"encoding/json"
-	"fmt"
-)
-
-type PoliteJSONFormatter struct{}
-
-func (f *PoliteJSONFormatter) Format(entry *Entry) ([]byte, error) {
-	serialized, err := json.Marshal(entry.Data)
-	if err != nil {
-		return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err)
-	}
-	return append(serialized, '\n'), nil
-}