Add two more date formats (mmcdole#157)

Author: nikstar

internal/shared/dateparser.go

@@ -23,6 +23,7 @@ var dateFormats = []string{
 	"Mon Jan 2 15:04 2006",
 	"Mon Jan 02, 2006 3:04 pm",
 	"Mon Jan 02 2006 15:04:05 -0700",
+	"Mon Jan 02 2006 15:04:05 GMT-0700 (MST)",
 	"Monday, January 2, 2006 03:04 PM",
 	"Monday, January 2, 2006",
 	"Monday, January 02, 2006",
@@ -64,6 +65,7 @@ var dateFormats = []string{
 	"Mon, 02 Jan 2006 15:04:05 -07",
 	"Mon, 02 Jan 2006 15:04:05 00",
 	"Mon, 02 Jan 2006 15:04:05",
+	"Mon, 02 Jan 2006 15:4:5 Z",
 	"Mon, 02 Jan 2006",
 	"January 2, 2006 3:04 PM",
 	"January 2, 2006, 3:04 p.m.",