v0.7.1

• Updated against stam-rust v0.14.0
• stam validate: Implemented text validation (annotation/stam-rust#5)
• stam import: Fixed parsing TSV columns
• stam view: Fixed ANSI colour output for tags
• stam annotate: Fixed support for mutable queries (was missing in v0.7.0)
• stram view: minor style improvement for HTML