python-attrs: fix typo in depends

ERROR: Nothing RPROVIDES 'python-crypto' (but ../meta-python/recipes-devtools/python/python-attrs_17.4.0.bb RDEPENDS on or otherwise requires it)
NOTE: Runtime target 'python-crypto' is unbuildable, removing...
Missing or unbuildable dependency chain was: ['python-crypto']

---
 meta-python/recipes-devtools/python/python-attrs.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 360f9c6..c29f058 100644
@@ -9,6 +9,6 @@ SRC_URI[sha256sum] = "1c7960ccfd6a005cd9f7ba884e6316b5e430a3f1a6c37c5f87d8b43f83
 inherit pypi
 
 RDEPENDS_${PN}_class-target += " \
-    ${PYTHON_PN}-crypto \
+    ${PYTHON_PN}-cryptography \
     ${PYTHON_PN}-ctypes \
 "    

2.7.4