修正bug

platform.lua

@@ -12,7 +12,7 @@ local exePath = findExePath()
 local exeDir  = exePath:gsub('[^/\\]-$', '')
 local dll     = exePath:sub(-4) == '.exe' and '.dll' or '.so'
 package.cpath = exeDir .. '?' .. dll
-if not package.loadlib('bee'..dll, 'luaopen_bee_platform') then
+if not package.loadlib(exeDir..'bee'..dll, 'luaopen_bee_platform') then
     error([[It doesn't seem to support your OS, please let me know at https://github.com/sumneko/lua-language-server/issues]])
 end