v0.3

Changes:

• Requires at least Go 1.10
• Uses Go 1.11 Modules
• Package dialects renamed to dialect (also dialect.MySQLis now a variable rather than a function)
• NullTime removed
• ScanWholeCols renamed to ScanAllRows
• omitinsert tag flag renamed to selectonly
• Added experimental Marshaler interface
• Preprocessor renamed to Translator
• MySQL: Fixed time precision