style: gofmt doc comments and sorted test imports

doc.go

@@ -15,16 +15,20 @@ If newer version than itself is detected, it downloads released binary from GitH
 There are some naming rules. Please read following links.
 
 Naming Rules of Released Binaries:
-  https://github.com/creativeprojects/go-selfupdate#naming-rules-of-released-binaries
+
+	https://github.com/creativeprojects/go-selfupdate#naming-rules-of-released-binaries
 
 Naming Rules of Git Tags:
-  https://github.com/creativeprojects/go-selfupdate#naming-rules-of-versions-git-tags
+
+	https://github.com/creativeprojects/go-selfupdate#naming-rules-of-versions-git-tags
 
 This package is hosted on GitHub:
-  https://github.com/creativeprojects/go-selfupdate
+
+	https://github.com/creativeprojects/go-selfupdate
 
 Small CLI tools as wrapper of this library are available also:
-  https://github.com/creativeprojects/go-selfupdate/cmd/detect-latest-release
-  https://github.com/creativeprojects/go-selfupdate/cmd/go-get-release
+
+	https://github.com/creativeprojects/go-selfupdate/cmd/detect-latest-release
+	https://github.com/creativeprojects/go-selfupdate/cmd/go-get-release
 */
 package selfupdate

mockdata_test.go

@@ -8,8 +8,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/stretchr/testify/require"
 	"github.com/ProtonMail/go-crypto/openpgp"
+	"github.com/stretchr/testify/require"
 )
 
 // mockSourceRepository creates a new *MockSource pre-populated with different versions and assets

update/doc.go

@@ -1,7 +1,7 @@
 /*
 Package update provides functionality to implement secure, self-updating Go programs (or other single-file targets).
 
-Basic Example
+# Basic Example
 
 This example shows how to update a program remotely from a URL.
 
@@ -28,8 +28,7 @@ This example shows how to update a program remotely from a URL.
 		return err
 	}
 
-
-Checksum Verification
+# Checksum Verification
 
 Updating executable code on a computer can be a dangerous operation unless you
 take the appropriate steps to guarantee the authenticity of the new code. While
@@ -67,7 +66,7 @@ specified as a hex string.
 		return err
 	}
 
-Cryptographic Signature Verification
+# Cryptographic Signature Verification
 
 Cryptographic verification of new code from an update is an extremely important way to guarantee the
 security and integrity of your updates.
@@ -120,7 +119,5 @@ with the private key and distribute the signature along with the update.
 		}
 		return err
 	}
-
-
 */
 package update

validate_test.go

@@ -11,10 +11,10 @@ import (
 	"os"
 	"testing"
 
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 	"github.com/ProtonMail/go-crypto/openpgp"
 	"github.com/ProtonMail/go-crypto/openpgp/armor"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestValidatorAssetNames(t *testing.T) {