📝 updated documentation

🔀 merge branch 'release/2.1.0' into develop

🔀 merge branch 'release/2.0.10' into develop

🔀 Merge branch 'release/2.0.9' into develop

🔖 Merge branch 'release/2.0.8' into develop

Merge branch 'release/2.0.7' into develop

Merge branch 'release/2.0.6' into develop

Merge branch 'release/2.0.5' into develop

Travis updated their Xcode

Merge branch 'release/2.0.3' into develop