Merge pull request #4617 from GitPaean/updating_interval_avoid_stallment

updating the interval when doing bisectBracket()

opm/simulators/wells/WellBhpThpCalculator.cpp

@@ -695,6 +695,7 @@ bisectBracket(const std::function<double(const double)>& eq,
                 eq_high = eq(high);
                 abs_high = std::fabs(eq_high);
             }
+            interval = high - low;
             ++bracket_attempts;
         }