v1.3.5

Features and fixes

• New test setup, fix linter errors. (06c7f3a)
• Add coverage tests. (9d60163)
• Add null value to variable. (a6e99cc)
• Fix varible y-axis title. (063a184)
• Expose UniqueObjectMeta. (d65f80c)
• Define proper singluar and plural names on unique classes. (2656f21)