Add driver 1.4.5 and 1.5.1 to test matrix
Add driver 1.4.5 and 1.5.1 to test matrix

Ensure the build prompt for 1.5.x is answered, similar to what was done in doctrine/mongodb-odm@4fe7d418353ba91cce02401ecc7ef72dece27ed9

bjori/mongodb,talkspirit/mongodb,researchgate/mongodb,lyft/mongodb,solocommand/mongodb,alcaeus/mongodb,taohaolong/mongodb-1,doctrine/mongodb,socialcdetest/test