Fix README

@@ -70,11 +70,11 @@ pdf.addPage(pw.Page(build: (pw.Context context) {
 To load an image from the network using the `printing` package:
 To load an image from the network using the `printing` package:
 
 
 ```dart
 ```dart
-final image = await networkImage('https://www.nfet.net/nfet.jpg');
+final netImage = await networkImage('https://www.nfet.net/nfet.jpg');
 
 
 pdf.addPage(pw.Page(build: (pw.Context context) {
 pdf.addPage(pw.Page(build: (pw.Context context) {
   return pw.Center(
   return pw.Center(
-    child: pw.Image(image),
+    child: pw.Image(netImage),
   ); // Center
   ); // Center
 })); // Page
 })); // Page
 ```
 ```

@@ -52,7 +52,7 @@ void main(List<String> args) async {
   final Map m = json.decode(d.toString());
   final Map m = json.decode(d.toString());
 
 
   final file = File('../printing/lib/src/fonts/gfonts.dart');
   final file = File('../printing/lib/src/fonts/gfonts.dart');
-  final output = await file.openWrite();
+  final output = file.openWrite();
 
 
   output.writeln('/*');
   output.writeln('/*');
   output.writeln(
   output.writeln(

@@ -56,8 +56,8 @@ void buildFile(String src, String dest, bool flutter) {
     st.writeln('import \'package:flutter/services.dart\' show rootBundle;');
     st.writeln('import \'package:flutter/services.dart\' show rootBundle;');
     st.writeln('import \'package:flutter/widgets.dart\' show AssetImage;');
     st.writeln('import \'package:flutter/widgets.dart\' show AssetImage;');
     st.writeln('import \'package:path_provider/path_provider.dart\';');
     st.writeln('import \'package:path_provider/path_provider.dart\';');
-    st.writeln('import \'package:printing/printing.dart\';');
   }
   }
+  st.writeln('import \'package:printing/printing.dart\';');
   st.writeln('import \'package:pdf/pdf.dart\';');
   st.writeln('import \'package:pdf/pdf.dart\';');
   st.writeln('import \'package:pdf/widgets.dart\' as pw;');
   st.writeln('import \'package:pdf/widgets.dart\' as pw;');