Fix installation script for Fedora.
diff --git a/start b/start
index 8e9f69e03c..349e07b3ce 100755
--- a/start
+++ b/start
@@ -43,6 +43,10 @@ if [ $os_name = 'Linux' ]; then
         if [ `dpkg-query -l | grep python-openssl | wc -l` == 0 ]; then
             sudo apt-get install -y python-openssl
         fi
+    elif [ `which dnf | wc -l` != 0 ]; then
+        if [ `dnf -q list installed | grep pyOpenSSL | wc -l` == 0 ]; then
+            sudo dnf install -y pyOpenSSL
+        fi
     elif [ `which yum | wc -l` != 0 ]; then
         if [ `yum -q list installed | grep pyOpenSSL | wc -l` == 0 ]; then
             sudo yum install -y pyOpenSSL

装了Fedora 23发现, Fedora用的不是`yum`, 所以改了一下脚本.
