Fix linter issues

Author: erikgeiser

.github/workflows/check.yml

@@ -17,4 +17,4 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.47
+          version: v1.50

examples/bubbletea_widget/main.go

@@ -1,3 +1,4 @@
+// Package main demonstrates how promptkit can be used as a bubbletea widget.
 package main
 
 import (
@@ -85,7 +86,9 @@ func main() {
 	model := newShoppingCart("Apples", "Milk", "Bread")
 
 	p := tea.NewProgram(model)
-	if err := p.Start(); err != nil {
+
+	_, err := p.Run()
+	if err != nil {
 		fmt.Fprintf(os.Stderr, "Error: %v", err)
 
 		os.Exit(1)

examples/confirmation/main.go

@@ -1,3 +1,4 @@
+// Package main demonstrates how promptkit/confirmation is used.
 package main
 
 import (

examples/confirmation_custom/main.go

@@ -1,3 +1,4 @@
+// Package main demonstrates how promptkit/confirmation can be customized.
 package main
 
 import (

examples/selection/main.go

@@ -1,3 +1,4 @@
+// Package main demonstrates how promptkit/selection is used.
 package main
 
 import (

examples/selection_custom/main.go

@@ -1,3 +1,4 @@
+// Package main demonstrates how promptkit/selection can be customized.
 package main
 
 import (

examples/textinput/main.go

@@ -1,3 +1,4 @@
+// Package main demonstrates how promptkit/textinput is used.
 package main
 
 import (

examples/textinput_custom/main.go

@@ -1,3 +1,4 @@
+// Package main demonstrates how promptkit/textinput can be customized.
 package main
 
 import (

examples/textinput_hidden/main.go

@@ -1,3 +1,5 @@
+// Package main demonstrates how promptkit/textinput can be used to ask for
+// passphrases.
 package main
 
 import (