hbs: update comment to remove line break

Template languages that generate HTML files, like Handlebars, are often
sensitive to whitespace, so adding a line break may change how a page is
rendered.

This commit adds a `~` at the end of the comment as a whitespace control
so the rendering engine removes the additional line break added by the
license header comment.

addlicense/main.go

@@ -375,7 +375,7 @@ func licenseHeader(path string, tmpl *template.Template, data LicenseData) ([]by
 	case ".hs", ".sql", ".sdl":
 		lic, err = executeTemplate(tmpl, data, "", "-- ", "")
 	case ".hbs":
-		lic, err = executeTemplate(tmpl, data, "{{!", "  ", "}}")
+		lic, err = executeTemplate(tmpl, data, "{{!", "  ", "~}}")
 	case ".html", ".htm", ".xml", ".vue", ".wxi", ".wxl", ".wxs":
 		lic, err = executeTemplate(tmpl, data, "<!--", " ", "-->")
 	case ".php":

addlicense/main_test.go

@@ -335,7 +335,7 @@ func TestLicenseHeader(t *testing.T) {
 		},
 		{
 			[]string{"f.hbs"},
-			"{{!\n  HYS\n}}\n\n",
+			"{{!\n  HYS\n~}}\n\n",
 		},
 		{
 			[]string{"f.html", "f.htm", "f.xml", "f.vue", "f.wxi", "f.wxl", "f.wxs"},