4.0.0

 * Replicate new issue_template from loopback (Siddhi Pai)
 * Replicate issue_template from loopback repo (Siddhi Pai)
 * fix linting problems (juanra)
 * Extract functions to base connector (ssh24)
 * Refactor alter table (ssh24)
 * Typo on README (#236) (Ctibor Laky)
 * Return if column is generated or not (#198) (Christiaan Westerbeek)
 * Upgrade to loopback-connector@4.x (Loay)
 * Refactor migration methods (ssh24)
 * Refactor Discovery Methods (Loay)
 * Remove old TODO and commented out code (Matthew Dickinson)
 * Fix autoupdate to create foreign keys after tables (Matthew Dickinson)
 * Add logging for errors encountered in discovery (Matthew Dickinson)
 * Update signature for alterTable (Matthew Dickinson)
 * Limit foreign key creation current connector (Matthew Dickinson)
 * Fix linting error (Matthew Dickinson)
 * Added test to validate foreign key handling (Matthew Dickinson)
 * Update foreign key creation table name handling (Matthew Dickinson)
 * Update alterTable to actually drop constraints (Matthew Dickinson)
 * Add rough handling for automatic foreign keys (Matthew Dickinson)
 * remove line not needed (#237) (ivy ho)
 * Update LB-connector version (Loay)