4.1.0

Minor version bump to pull in bug fixes and updates.

Fixes:

• Fix cannot read property metrics of undefined (#120)
• Fix issue 115 "Cannot read property 'type' of undefined" (#116)

Updates:

• Add Field Data Wording for CLS and LCP (#121)
• Add link to opportunities (#113)
• Update package googleapis to ^47.0.0 (#110)
• Round percentum in output message (#109)

Thanks to @JuanMaRuiz, @tonysan, @Yashko, and @midudev 🎉