Upgrade release number to 0.6.0 (oq-engine 1.3.0)
Upgrade release number to 0.6.0 (oq-engine 1.3.0)

g-weatherill/oq-risklib,gem/oq-engine,gem/oq-engine,vup1120/oq-risklib,g-weatherill/oq-risklib,raoanirudh/oq-risklib,gem/oq-engine,raoanirudh/oq-risklib,gem/oq-engine,gem/oq-engine,g-weatherill/oq-risklib,vup1120/oq-risklib