v0.2.0

• added assert_shwild_matches!() and assert_shwild_not_matches!() test assertion macros, available with the "assertions" feature (enabled by default);
• added "flexible-flags-type" feature — optional base-traits dependency (implement-AsI64-for-built_ins) allowing macro flags parameters to be any type implementing AsI64; when disabled, flags must be i64;
• "assertions" no longer implies base-traits; use "full" to enable assertions, flexible flags, and lookup ranges together;
• extended shwild_matches!() 3-parameter form with the same flexible-flags behaviour;
• crate-level and macro /// documentation for the assertion macros;
• README.md macros and dependencies sections updated;