Unzip with overwrite

src/freedombone-app-ghost

@@ -185,7 +185,7 @@ function upgrade_ghost {
         exit 729856
     fi
 
-    unzip Ghost-${GHOST_VERSION}.zip
+    unzip -o Ghost-${GHOST_VERSION}.zip
     if [ ! -f $GHOST_PATH/index.js ]; then
         echo $'ghost failed to unzip'
         exit 63835
@@ -407,7 +407,7 @@ function install_ghost {
         exit 729856
     fi
 
-    unzip Ghost-${GHOST_VERSION}.zip
+    unzip -o Ghost-${GHOST_VERSION}.zip
     if [ ! -f /var/www/${GHOST_DOMAIN_NAME}/htdocs/index.js ]; then
         echo $'ghost failed to unzip'
         rm -rf /var/www/$GHOST_DOMAIN_NAME