Laravel 7 support & other improvements

Merge pull request #204 from rjorel/master

Minor changes

Laravel 6.0 support

Merge pull request #203 from kylekatarnls/patch-1

Allow Laravel 6.0

1.11.0: Merge pull request #192 from jsdecena/master

Replace the helper with the static method

1.10.4: Merge pull request #182 from putchi/patch-1

Update SearchableTrait.php

1.10.3: Merge pull request #178 from Hvitgar/master

fixed pgsql bug

1.10.2: Merge pull request #175 from Maras0830/master

Allow search input '' or null.

1.10.1: Merge pull request #149 from veneliniliev/master

When search "0"

1.10.0: Merge pull request #169 from morphet81/master

Fix bug #93 completing Tamrael's modification

1.9.6: Merge pull request #139 from kordero/master

search query: content in quotes is treated as a single word

1.9.5: Merge pull request #127 from n1crack/master

fix for bindings order when using where clause