Ensure hybrid samplers' sampleset has wait_id()

The fix is implemented in dwavesystems/dimod#1393,
and supported by dwavesystems/dwave-cloud-client#674.

Author: randomir

requirements.txt

@@ -1,4 +1,4 @@
-dimod==0.12.17
+dimod==0.12.18
 dwave-optimization==0.4.0
 dwave-preprocessing==0.6.7
 dwave-cloud-client==0.12.0

setup.py

@@ -24,7 +24,7 @@
 exec(open(os.path.join(".", "dwave", "system", "package_info.py")).read())
 
 
-install_requires = ['dimod>=0.12.7,<0.14.0',
+install_requires = ['dimod>=0.12.18,<0.14.0',
                     'dwave-optimization>=0.1.0,<0.6',
                     'dwave-cloud-client>=0.12.0,<0.14.0',
                     'dwave-networkx>=0.8.10',