update cast dependency

Author: miladrahimi

go.mod

@@ -3,7 +3,7 @@ module github.com/golobby/env/v2
 go 1.11
 
 require (
-	github.com/golobby/cast v1.3.0
+	github.com/golobby/cast v1.3.1
 	github.com/kr/pretty v0.3.1 // indirect
 	github.com/stretchr/testify v1.8.1
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect

go.sum

@@ -4,6 +4,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/golobby/cast v1.3.0 h1:8nM9nYU5Pzi1LWXwISx0xhW/7oWXPt9r0hdTC1nnPSI=
 github.com/golobby/cast v1.3.0/go.mod h1:WCusT3z1fzp4XVBUGbWy61insoQS8CPJHNTQwlW8qnM=
+github.com/golobby/cast v1.3.1 h1:wQBxrwmuTke6YGE45pOpBv0msSkOzmwYBR5TGPIn+Tg=
+github.com/golobby/cast v1.3.1/go.mod h1:uf72FJNQDdYlKxCfP6iH7W5n5aZz1O/1JGNssFZB4gI=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=