Don't provide .7z build for Mac

For simplicity and because Mac has nice support for .zip out of the box
(unpacks it automatically).

We may provide .zip for Windows too but build would weight quite much
and 7-zip (or WinRAR which supports .7z) should be installed quite often
on typical Windows machine.

package.json

@@ -19,7 +19,7 @@
     "mpv-lin64": "node-gyp rebuild && strip build/Release/boram.node -o dist/app/libboram.so && strip build/Release/checklib -o dist/app/checklib",
     "pack-win32": "electron-packager dist/app --no-prune --platform=win32 --arch=ia32 --out=dist --icon=src/index/icon.ico --app-copyright='Copyright (c) 2016-2018 T-ara Industries' --win32metadata.CompanyName='T-ara Industries' --win32metadata.FileDescription='Cross-platform WebM converter' --win32metadata.OriginalFilename=boram.exe --win32metadata.ProductName=boram && cd dist && rm *win-x86/LICENSE* && cp -a ../licenses *win-x86 && 7z a -m0=lzma2 -mx=9 $(echo *win-x86).7z *win-x86",
     "pack-win64": "electron-packager dist/app --no-prune --platform=win32 --arch=x64 --out=dist --icon=src/index/icon.ico --app-copyright='Copyright (c) 2016-2018 T-ara Industries' --win32metadata.CompanyName='T-ara Industries' --win32metadata.FileDescription='Cross-platform WebM converter' --win32metadata.OriginalFilename=boram.exe --win32metadata.ProductName=boram && cd dist && rm *win-x64/LICENSE* && cp -a ../licenses *win-x64 && 7z a -m0=lzma2 -mx=9 $(echo *win-x64).7z *win-x64",
-    "pack-mac64": "electron-packager dist/app --no-prune --platform=darwin --arch=x64 --out=dist --icon=src/index/icon.icns --app-copyright='Copyright (c) 2016-2018 T-ara Industries' --app-category-type=public.app-category.video && cd dist/*darwin-x64 && mv boram.app boram-v${npm_package_version}.app && 7z a -m0=lzma2 -mx=9 $(echo ../*darwin-x64).7z *.app && 7z a -tzip -mx=9 $(echo ../*darwin-x64).zip *.app",
+    "pack-mac64": "electron-packager dist/app --no-prune --platform=darwin --arch=x64 --out=dist --icon=src/index/icon.icns --app-copyright='Copyright (c) 2016-2018 T-ara Industries' --app-category-type=public.app-category.video && cd dist/*darwin-x64 && mv boram.app boram-v${npm_package_version}.app && 7z a -tzip -mx=9 $(echo ../*darwin-x64).zip *.app",
     "pack-lin64": "electron-packager dist/app --no-prune --platform=linux --arch=x64 --out=dist && cd dist && rm *linux-x64/LICENSE* && cp -a ../licenses *linux-x64 && strip ../build/Release/ffmpeg58.node -o *linux-x64/libffmpeg.so && strip ../build/Release/ffmpeg57.node -o $(echo *linux-x64)/libffmpeg.so.57 && 7z a -m0=lzma2 -mx=9 $(echo *linux-x64).7z *linux-x64",
     "release-win32": "rm -rf dist/*win-x86* && BORAM_PLATFORM=win32 npm run app && npm run mpv-win32 && npm run pack-win32",
     "release-win64": "rm -rf dist/*win-x64* && BORAM_PLATFORM=win64 npm run app && npm run mpv-win64 && npm run pack-win64",