Added metered key setting to a couple of examples where it was missin…

…g. (#248)

text/pdf_highlight_text.go

@@ -10,22 +10,23 @@ import (
 	"fmt"
 	"os"
 	"strings"
+
+	"github.com/unidoc/unipdf/v3/common/license"
 	"github.com/unidoc/unipdf/v3/creator"
 	"github.com/unidoc/unipdf/v3/extractor"
 	"github.com/unidoc/unipdf/v3/model"
 )
 
+func init() {
+	// Make sure to load your metered License API key prior to using the library.
+	// If you need a key, you can sign up and create a free one at https://cloud.unidoc.io
+	err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`))
+	if err != nil {
+		panic(err)
+	}
+}
+
 func main() {
-	// Make sure to enter a valid license key.
-	// Otherwise the code will exit with a panic error.
-	// License keys are available via: https://unidoc.io
-	/*
-			license.SetLicenseKey(`
-		-----BEGIN UNIDOC LICENSE KEY-----
-		...key contents...
-		-----END UNIDOC LICENSE KEY-----
-		`)
-	*/
 	if len(os.Args) < 4 {
 		fmt.Printf("Usage: go run pdf_highlight_text.go <input.pdf> <output.pdf> <term> \n")
 		os.Exit(0)

text/pdf_search_replace_advanced.go

@@ -17,12 +17,22 @@ import (
 	"strings"
 
 	"github.com/unidoc/unipdf/v3/common"
+	"github.com/unidoc/unipdf/v3/common/license"
 	"github.com/unidoc/unipdf/v3/contentstream"
 	"github.com/unidoc/unipdf/v3/core"
 	"github.com/unidoc/unipdf/v3/model"
 	"github.com/unidoc/unipdf/v3/model/optimize"
 )
 
+func init() {
+	// Make sure to load your metered License API key prior to using the library.
+	// If you need a key, you can sign up and create a free one at https://cloud.unidoc.io
+	err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`))
+	if err != nil {
+		panic(err)
+	}
+}
+
 type textChunk struct {
 	font   *model.PdfFont
 	strObj *core.PdfObjectString