Use true module path

The previous module path `arduino.cc/repository` only served as an arbitrary identifier, but did not have the expected support for `go get`/`go install`:

```
$ go get arduino.cc/repository
go get arduino.cc/repository: unrecognized import path "arduino.cc/repository": reading https://arduino.cc/repository?go-get=1: 404 Not Found
```

go.mod

@@ -1,4 +1,4 @@
-module arduino.cc/repository
+module github.com/arduino/libraries-repository-engine
 
 go 1.14
 

internal/libraries/db/library.go

@@ -28,7 +28,7 @@ import (
 	"regexp"
 	"strings"
 
-	"arduino.cc/repository/internal/libraries/metadata"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/metadata"
 )
 
 // FromLibraryToRelease extract a Release from LibraryMetadata. LibraryMetadata must be

internal/libraries/git_integration_test.go

@@ -29,8 +29,8 @@ import (
 	"path/filepath"
 	"testing"
 
-	"arduino.cc/repository/internal/libraries/db"
-	"arduino.cc/repository/internal/libraries/gitutils"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/db"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/gitutils"
 	"github.com/stretchr/testify/require"
 )
 

internal/libraries/repoarchive.go

@@ -28,8 +28,8 @@ import (
 	"path/filepath"
 	"regexp"
 
-	"arduino.cc/repository/internal/libraries/metadata"
-	"arduino.cc/repository/internal/libraries/zip"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/metadata"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/zip"
 )
 
 // ZipRepo creates a ZIP archive of the repo folder and returns its path.

internal/libraries/repoclone.go

@@ -28,11 +28,11 @@ import (
 	"os"
 	"path/filepath"
 
-	"arduino.cc/repository/internal/libraries/db"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/db"
 
 	"fmt"
 
-	"arduino.cc/repository/internal/libraries/metadata"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/metadata"
 	"github.com/go-git/go-git/v5"
 )
 

internal/libraries/zip/ziphelper.go

@@ -30,7 +30,7 @@ import (
 	"os/exec"
 	"path/filepath"
 
-	"arduino.cc/repository/internal/libraries/file"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/file"
 )
 
 // Directory creates a new zip archive that contains a copy of "rootFolder" into "zipFile".

libraries/repolist.go

@@ -24,7 +24,7 @@
 package libraries
 
 import (
-	"arduino.cc/repository/internal/libraries"
+	"github.com/arduino/libraries-repository-engine/internal/libraries"
 )
 
 // LoadRepoListFromFile returns an unfiltered list of library registry entries loaded from the given data file.

libraries/repolist_test.go

@@ -26,7 +26,7 @@ package libraries
 import (
 	"testing"
 
-	"arduino.cc/repository/internal/libraries"
+	"github.com/arduino/libraries-repository-engine/internal/libraries"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )

sync_libraries.go

@@ -32,11 +32,11 @@ import (
 	"os"
 	"path/filepath"
 
-	"arduino.cc/repository/internal/libraries"
-	"arduino.cc/repository/internal/libraries/db"
-	"arduino.cc/repository/internal/libraries/gitutils"
-	"arduino.cc/repository/internal/libraries/hash"
 	cc "github.com/arduino/golang-concurrent-workers"
+	"github.com/arduino/libraries-repository-engine/internal/libraries"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/db"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/gitutils"
+	"github.com/arduino/libraries-repository-engine/internal/libraries/hash"
 	"github.com/go-git/go-git/v5/plumbing"
 )