Merge pull request #1896 from glotzerlab/slightly-prettier-warning-me…

…ssage

Fix minor typo in IntegratorTwoStep.cc

hoomd/md/IntegratorTwoStep.cc

@@ -235,7 +235,7 @@ void IntegratorTwoStep::prepRun(uint64_t timestep)
     if (!m_integrate_rotational_dof && areForcesAnisotropic())
         {
         m_exec_conf->msg->warning() << "Forces provide torques, but integrate_rotational_dof is"
-                                       "false."
+                                       " false."
                                     << endl;
         }