Fix compiler warnings

Package.swift

@@ -12,8 +12,15 @@ let package = Package(
      targets: [
         .target(
                name: "SwiftCharts",
-               path: "SwiftCharts"
+               path: "SwiftCharts",
+               swiftSettings: [
+                               .unsafeFlags(["-Xfrontend", "-application-extension"])
+                           ],
+               linkerSettings: [
+                               .unsafeFlags(["-Xlinker", "-application_extension"])
+                           ]
         )
+
      ],
      swiftLanguageVersions: [.v5]
- )
+)

SwiftCharts/Axis/ChartAxisLabel.swift

@@ -53,10 +53,10 @@ open class ChartAxisLabel {
 
 extension ChartAxisLabel: CustomDebugStringConvertible {
     public var debugDescription: String {
-        return [
+        return ([
             "text": text,
             "settings": settings
-        ]
+        ] as [String : Any])
             .debugDescription
     }
 }

SwiftCharts/Axis/ChartAxisModel.swift

@@ -94,12 +94,12 @@ open class ChartAxisModel {
 
 extension ChartAxisModel: CustomDebugStringConvertible {
     public var debugDescription: String {
-        return [
+        return ([
             "firstModelValue": firstModelValue,
             "lastModelValue": lastModelValue,
             "axisTitleLabels": axisTitleLabels,
 
-        ]
+        ] as [String : Any])
             .debugDescription
     }
 }

SwiftCharts/Drawers/ChartLabelDrawer.swift

@@ -41,14 +41,14 @@ public extension ChartLabelSettings {
 
 extension ChartLabelSettings: CustomDebugStringConvertible {
     public var debugDescription: String {
-        return [
+        return ([
             "font": font,
             "fontColor": fontColor,
             "rotation": rotation,
             "rotationKeep": rotationKeep,
             "shiftXOnRotation": shiftXOnRotation,
             "textAlignment": textAlignment
-            ]
+        ] as [String : Any])
                 .debugDescription
     }
 }

SwiftCharts/Layers/ChartStackedBarsLayer.swift

@@ -33,13 +33,13 @@ open class ChartStackedBarModel: ChartBarModel {
 }
 
 extension ChartStackedBarModel: CustomDebugStringConvertible {
-    open var debugDescription: String {
-        return [
+    public var debugDescription: String {
+        return ([
             "items": items,
             "constant": constant,
             "axisValue1": axisValue1,
             "axisValue2": axisValue2
-            ]
+        ] as [String : Any])
             .debugDescription
     }
 }