Release 1.5.9

• Bump vm2 from 3.9.12 to 3.9.16 #5
• Bump xml2js from 0.4.19 to 0.5.0 #4
• Bump cacheable-request from 10.2.3 to 10.2.7 #2
• Bump http-cache-semantics from 4.1.0 to 4.1.1 #1
• Update package.json 6129b63

v1.5.8

Full Changelog: https://github.com/sematext/node-gcstats/commits/1.5.8