fix: build script was targeting the wrong file name

Author: ghost1face

src/Squirrel.nuspec

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
   <metadata>
-    <version>2.1.1</version>
+    <version>2.1.2</version>
     <authors>GitHub</authors>
     <owners>Anaïs Betts</owners>
     <licenseUrl>https://github.com/squirrel/Squirrel.Windows/blob/master/COPYING</licenseUrl>

src/build_official.cmd

@@ -40,8 +40,10 @@ nuget pack Squirrel.nuspec -OutputDirectory ..\build\artifacts || exit /b
 
 md ..\build\artifacts\electron-winstaller\vendor
 
-copy ..\build\Release\net462\Update462.exe ..\build\artifacts\electron-winstaller\vendor\Squirrel.exe || exit /b
-copy ..\build\Release\net462\Update462.pdb ..\build\artifacts\electron-winstaller\vendor\Squirrel.pdb || exit /b
+:: electron-builder expects the normally renamed Squirrel.exe to be Update.exe in it's project
+:: we'll rename all to Update.exe along with the .pdb
+copy ..\build\Release\net462\Update462.exe ..\build\artifacts\electron-winstaller\vendor\Update.exe || exit /b
+copy ..\build\Release\net462\Update462.pdb ..\build\artifacts\electron-winstaller\vendor\Update.pdb || exit /b
 copy ..\build\Release\net462\Update.com ..\build\artifacts\electron-winstaller\vendor\Update.com || exit /b
 copy ..\build\Release\Win32\Setup.exe ..\build\artifacts\electron-winstaller\vendor || exit /b
 copy ..\build\Release\Win32\Setup.pdb ..\build\artifacts\electron-winstaller\vendor || exit /b

version.json

@@ -1,5 +1,5 @@
 {
-  "version": "2.1.1",
+  "version": "2.1.2",
   "publicReleaseRefSpec": [
     "^refs/heads/master$"
   ],