Fix emptying Sauce Connect cache #ImAnIdiot

`rm -rf .` unlinks the current directory, which we're still in, so the
subsequent sc-*-linux still finds the old Sauce Connect.

circle.yml

diff --git a/circle.yml b/circle.yml
index 5ad0a7b..e4b6389 100644
--- a/circle.yml
+++ b/circle.yml
@@ -57,7 +57,7 @@
         test -e ~/sauce_was_ready && exit
 
         echo 'Sauce Connect failed, try redownloading (https://git.io/vSxsJ)'
-        rm -rf .
+        rm -rf *
         time wget https://saucelabs.com/downloads/sc-latest-linux.tar.gz
         time tar -xzf sc-latest-linux.tar.gz