Bump github.com/d5/tengo/v2 from 2.5.0 to 2.6.0 (#515)

Bumps [github.com/d5/tengo/v2](https://github.com/d5/tengo) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/d5/tengo/releases)
- [Changelog](https://github.com/d5/tengo/blob/master/.goreleaser.yml)
- [Commits](https://github.com/d5/tengo/compare/v2.5.0...v2.6.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

go.mod

@@ -3,7 +3,7 @@ module github.com/thrasher-corp/gocryptotrader
 go 1.12
 
 require (
-	github.com/d5/tengo/v2 v2.5.0
+	github.com/d5/tengo/v2 v2.6.0
 	github.com/gofrs/uuid v3.3.0+incompatible
 	github.com/golang/protobuf v1.4.2
 	github.com/google/go-querystring v1.0.0