Update tsconfig.json

[UNDERHMA]

Adding "skipLibCheck": true to thetsconfig.json. When we were ng building, angular material was throwing the bug:

Error: node_modules/saturn-datepicker/datepicker/datepicker.d.ts:57:22 - error TS2420: Class 'SatDatepicker' incorrectly implementCanColor'.
Property 'defaultColor' is missing in type 'SatDatepicker' but required in type 'CanColor'.

57 export declare class SatDatepicker implements OnDestroy, CanColor {
~~~~~~~~~~~~~

node_modules/@angular/material/core/common-behaviors/color.d.ts:15:5
15 defaultColor: ThemePalette | undefined;
~~~~~~~~~~~~
'defaultColor' is declared here.

An imported library (saturn-datepicker) had a bug in one of its files that wasn't allowing it to compile with angular material:

SaturnTeam/saturn-datepicker#157

This issue was still outstanding, and the only options to fix this and compile our project was to either edit the node_modules by hand, which each user would need to do manually, or add "skipLibCheck": true to the tsconfig.json. Here is what this setting does:

"Enabling --skipLibCheck can help work around these issues. Turning it on will prevent Typescript from type-checking the entire imported libraries. Instead, Typescript will only type-check the code you use against these types. This means that as long as you aren't using the incompatible parts of imported libraries, they'll compile just fine."

-https://stackoverflow.com/questions/52311779/usage-of-the-typescript-compiler-argument-skiplibcheck

We also should add this to the README, so that future groups know we made this setting change.

[UNDERHMA]

Added the update to the README