Enable GZip compression & Leverage browser caching

.htaccess

AddDefaultCharset UTF-8

Options -Indexes

<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE application/javascript
    AddOutputFilterByType DEFLATE application/json
    AddOutputFilterByType DEFLATE application/x-javascript
    AddOutputFilterByType DEFLATE application/vnd.ms-fontobject
    AddOutputFilterByType DEFLATE font/ttf
    AddOutputFilterByType DEFLATE font/otf
    AddOutputFilterByType DEFLATE image/svg+xml
    AddOutputFilterByType DEFLATE text/css
    AddOutputFilterByType DEFLATE text/javascript
    AddOutputFilterByType DEFLATE text/plain
    AddOutputFilterByType DEFLATE text/html
    AddOutputFilterByType DEFLATE text/xml
</IfModule>

<IfModule mod_mime.c>
    AddType font/opentype .otf
    AddType application/font-woff .woff
    AddType application/font-woff2 .woff2
    AddType application/x-font-ttf .ttf
    AddType application/vnd.ms-fontobject .eot
    AddType image/svg+xml .svg
</IfModule>

<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresDefault "access plus 1 seconds"
    ExpiresByType application/javascript "access plus 6 months"
    ExpiresByType application/vnd.ms-fontobject "access plus 6 months"
    ExpiresByType application/xhtml+xml "access plus 10 minutes"
    ExpiresByType application/x-javascript "access plus 6 months"
    ExpiresByType application/x-shockwave-flash "access plus 6 months"
    ExpiresByType application/x-woff "access plus 6 months"
    ExpiresByType application/x-woff2 "access plus 6 months"
    ExpiresByType font/otf "access plus 6 months"
    ExpiresByType font/ttf "access plus 6 months"
    ExpiresByType image/gif "access plus 6 months"
    ExpiresByType image/jpeg "access plus 6 months"
    ExpiresByType image/png "access plus 6 months"
    ExpiresByType image/svg+xml "access plus 6 months"
    ExpiresByType image/x-icon "access plus 6 months"
    ExpiresByType text/css "access plus 6 months"
    ExpiresByType text/html "access plus 10 minutes"
    ExpiresByType text/javascript "access plus 6 months"
    ExpiresByType video/x-flv "access plus 6 months"
</IfModule>

<IfModule mod_headers.c>
    <FilesMatch "\\.(ico|jpe?g|png|gif|swf)$">
        Header set Cache-Control "max-age=14515200, public"
    </FilesMatch>
    <FilesMatch "\\.(css)$">
        Header set Cache-Control "max-age=14515200, public"
    </FilesMatch>
    <FilesMatch "\\.(js)$">
        Header set Cache-Control "max-age=14515200, public"
    </FilesMatch>
    <FilesMatch "\.(ttf|otf|eot|woff|woff2|svg)$">
        Header set Cache-Control "max-age=14515200, public"
    </FilesMatch>

    #Header unset ETag
    #Header unset Last-Modified
</IfModule>

Leverage browser caching for woff2 doesn't work.
I still get the warning

can we use this for websites hosted in github?

Add "ExpiresByType application/x-woff2 "access plus 6 months"" inside ""..."" will solve