Fix a typo in an error message (#411)

Author: nex3

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.9.3
+
+* Fix a typo in an error message.
+
 ## 1.9.2
 
 ### Node JS API

lib/src/functions.dart

@@ -377,7 +377,7 @@ final List<BuiltInCallable> coreFunctions = new UnmodifiableListView([
     var argumentList = arguments[1] as SassArgumentList;
     if (argumentList.asList.isNotEmpty) {
       throw new SassScriptException(
-          "Only only positional argument is allowed. All other arguments must "
+          "Only one positional argument is allowed. All other arguments must "
           "be passed by name.");
     }
 
@@ -430,7 +430,7 @@ final List<BuiltInCallable> coreFunctions = new UnmodifiableListView([
     var argumentList = arguments[1] as SassArgumentList;
     if (argumentList.asList.isNotEmpty) {
       throw new SassScriptException(
-          "Only only positional argument is allowed. All other arguments must "
+          "Only one positional argument is allowed. All other arguments must "
           "be passed by name.");
     }
 
@@ -491,7 +491,7 @@ final List<BuiltInCallable> coreFunctions = new UnmodifiableListView([
     var argumentList = arguments[1] as SassArgumentList;
     if (argumentList.asList.isNotEmpty) {
       throw new SassScriptException(
-          "Only only positional argument is allowed. All other arguments must "
+          "Only one positional argument is allowed. All other arguments must "
           "be passed by name.");
     }
 

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sass
-version: 1.9.2
+version: 1.9.3-dev
 description: A Sass implementation in Dart.
 author: Dart Team <[email protected]>
 homepage: https://github.com/sass/dart-sass