Installer: fix readme file

Author: eventhorizon5

tools/installer/skyscraper.iss

@@ -96,7 +96,7 @@ Source: "C:\Users\winbuild\Desktop\Release\skyscraper\Plugin_CgProgramManager.pd
 Source: "C:\Users\winbuild\Desktop\Release\skyscraper\Plugin_OctreeSceneManager.dll"; DestDir: "{app}"; Flags: ignoreversion
 Source: "C:\Users\winbuild\Desktop\Release\skyscraper\Plugin_OctreeSceneManager.pdb"; DestDir: "{app}"; Flags: ignoreversion
 Source: "C:\Users\winbuild\Desktop\Release\skyscraper\plugins.cfg"; DestDir: "{app}"; Flags: ignoreversion
-Source: "C:\Users\winbuild\Desktop\Release\skyscraper\readme.txt"; DestDir: "{app}"; Flags: ignoreversion
+Source: "C:\Users\winbuild\Desktop\Release\skyscraper\README.md"; DestDir: "{app}"; Flags: ignoreversion
 Source: "C:\Users\winbuild\Desktop\Release\skyscraper\RenderSystem_Direct3D11.dll"; DestDir: "{app}"; Flags: ignoreversion
 Source: "C:\Users\winbuild\Desktop\Release\skyscraper\RenderSystem_Direct3D11.pdb"; DestDir: "{app}"; Flags: ignoreversion
 Source: "C:\Users\winbuild\Desktop\Release\skyscraper\RenderSystem_Direct3D9.dll"; DestDir: "{app}"; Flags: ignoreversion