[fix] pipe copy statement diff (Snowflake-Labs#184)

Is this an acceptable fix for comparing multi-line `copy_statement`s in the pipe resource. Tested it locally in our dev snowflake environment, it seems to not detect changes anymore.

## References
* Potential fix for Snowflake-Labs#180 

[Travis build](https://travis-ci.com/github/henriblancke/terraform-provider-snowflake/builds/162804020)

pkg/resources/pipe.go

@@ -45,6 +45,12 @@ var pipeSchema = map[string]*schema.Schema{
 		Required:    true,
 		ForceNew:    true,
 		Description: "Specifies the copy statement for the pipe.",
+		DiffSuppressFunc: func(k, old, new string, d *schema.ResourceData) bool {
+			if strings.TrimSuffix(old, "\n") == strings.TrimSuffix(new, "\n") {
+				return true
+			}
+			return false
+		},
 	},
 	"auto_ingest": &schema.Schema{
 		Type:        schema.TypeBool,
@@ -338,6 +344,5 @@ func showPipe(db *sql.DB, query string) (showPipeResult, error) {
 	if err != nil {
 		return r, err
 	}
-
 	return r, nil
 }