1.6.4

• Bugfix for select/spinner arrows sprite overlapping option label when non-supported value of _spriteSize (> 2) is set through GEM_adafruit_gfx::setSpriteSize();
• title argument made optional in GEMPage constructor: now it is possible to call GEMPage menuPage to create menu page with empty title (instead of passing empty string, e.g. GEMPage menuPage(""));
• Optional loop setting for selects (GEMSelect) and spinners (GEMSpinner) added to allow endless loop through the options;
• Clarification on PlatformIO installation (contributed by @thijstriemstra);
• Readme updated accordingly.