Remove pkg folder

Motivation: golang-standards/project-layout#117

Author: Leonardo Schettini

pkg/postgres/holdings.go postgres/holdings.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/jackc/pgx/v4/pgx"
+	"github.com/jackc/pgx/v4"
 	"github.com/leoschet/gaivota"
 )
 

pkg/postgres/investments.go postgres/investments.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/jackc/pgx/v4/pgx"
+	"github.com/jackc/pgx/v4"
 	"github.com/leoschet/gaivota"
 )
 

pkg/postgres/portfolios.go postgres/portfolios.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/jackc/pgx/v4/pgx"
+	"github.com/jackc/pgx/v4"
 	"github.com/leoschet/gaivota"
 )
 

pkg/postgres/positions.go postgres/positions.go

@@ -4,8 +4,6 @@ import (
 	"context"
 	"regexp"
 	"strings"
-
-	"github.com/jackc/pgx/v4/pgxpool"
 )
 
 var matchFirstCap = regexp.MustCompile("(.)([A-Z][a-z]+)")

pkg/postgres/postgres.go postgres/postgres.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/jackc/pgx/v4/pgx"
+	"github.com/jackc/pgx/v4"
 	"github.com/leoschet/gaivota"
 )
 

pkg/postgres/users.go postgres/users.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/jackc/pgx/v4/pgx"
+	"github.com/jackc/pgx/v4"
 	"github.com/leoschet/gaivota"
 )