Update module github.com/shopspring/decimal to v1.3.1

This MR contains the following updates:

Package	Type	Update	Change
github.com/shopspring/decimal	require	minor	v1.2.0 -> v1.3.1

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go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/go-telegram-bot-api/telegram-bot-api v4.6.4+incompatible
 	github.com/lib/pq v1.8.0
 	github.com/llgcode/draw2d v0.0.0-20200603164053-19660b984a28
-	github.com/shopspring/decimal v1.2.0
+	github.com/shopspring/decimal v1.4.0
 	github.com/spf13/viper v1.7.1
 	github.com/superoo7/go-gecko v1.0.0
 	gopkg.in/fsnotify.v1 v1.4.7