Update README.md

[amuzalevskiy]

$ npm install -g gemini
npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher
to avoid a RegExp DoS issue
npm WARN deprecated node-uuid@1.4.7: use uuid module instead
C:\Users\Andrey\AppData\Roaming\npm\gemini -> C:\Users\Andrey\AppData\Roaming\np
m\node_modules\gemini\bin\gemini

png-img@2.1.1 install C:\Users\Andrey\AppData\Roaming\npm\node_modules\gemini
node_modules\png-img
node-gyp rebuild

C:\Users\Andrey\AppData\Roaming\npm\node_modules\gemini\node_modules\png-img>if
not defined npm_config_node_gyp (node "c:\Program Files\nodejs\node_modules\npm
bin\node-gyp-bin\....\node_modules\node-gyp\bin\node-gyp.js" rebuild ) else (
node "" rebuild )
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "python", you can set the PYT
HON env variable.
gyp ERR! stack at failNoPython (c:\Program Files\nodejs\node_modules\npm\nod
e_modules\node-gyp\lib\configure.js:401:14)
gyp ERR! stack at c:\Program Files\nodejs\node_modules\npm\node_modules\node
-gyp\lib\configure.js:356:11
gyp ERR! stack at FSReqWrap.oncomplete (fs.js:82:15)
gyp ERR! System Windows_NT 6.1.7601
gyp ERR! command "c:\Program Files\nodejs\node.exe" "c:\Program Files\nodej
s\node_modules\npm\node_modules\node-gyp\bin\node-gyp.js" "rebuild"
gyp ERR! cwd C:\Users\Andrey\AppData\Roaming\npm\node_modules\gemini\node_module
s\png-img
gyp ERR! node -v v5.10.1
gyp ERR! node-gyp -v v3.3.1
gyp ERR! not ok
C:\Users\Andrey\AppData\Roaming\npm
`-- (empty)

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "c:\Program Files\nodejs\node.exe" "c:\Program Files\nodejs\
node_modules\npm\bin\npm-cli.js" "install" "-g" "gemini"
npm ERR! node v5.10.1
npm ERR! npm v3.8.3
npm ERR! code ELIFECYCLE

npm ERR! png-img@2.1.1 install: node-gyp rebuild
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the png-img@2.1.1 install script 'node-gyp rebuild'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the png-img package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node-gyp rebuild
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs png-img
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls png-img
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! C:\projects\widget\npm-debug.log
npm ERR! code 1

[j0tunn]

Thanks for your PR. Sorry for long delay.
Could you rebase please?