v0.16.0

PSRClassesInterface v0.16.0

Diff since v0.15.0

Merged pull requests:

• Increase the margin in JuliaFormatter (#169) (@raphasampaio)
• Add two new functions to get references (#216) (@guilhermebodin)
• Add new metadata tags to pmd (#219) (@guilhermebodin)

Closed issues:

• PSRI SQLite interface reads trash from null references (#215)