skew() now can take angle arguments.

README.md

@@ -5,6 +5,8 @@
 
 A library for OpenSCAD, filled with useful tools, shapes, masks, math and manipulators, designed to make OpenSCAD easier to use.
 
+Requires OpenSCAD 2021.01 or later.
+
 - **NOTE:** BOSL2 IS BETA CODE.  THE CODE IS STILL BEING REORGANIZED.
 - **NOTE2:** CODE WRITTEN FOR BOSLv1 PROBABLY WON'T WORK WITH BOSL2!
 
@@ -31,15 +33,15 @@ A lot of the features of this library are to allow shorter, easier-to-read, inte
 `xrot(30,cp=[0,10,20])`         | `translate([0,10,20]) rotate([30,0,0]) translate([0,-10,-20])`
 `xcopies(20,n=3)`               | `for (dx=[-20,0,20]) translate([dx,0,0])`
 `zrot_copies(n=6,r=20)`         | `for (zr=[0:5]) rotate([0,0,zr*60]) translate([20,0,0])`
-`skew_xy(xa=30,ya=45)`          | `multmatrix([[1,0,tan(30),0],[0,1,tan(45),0],[0,0,1,0],[0,0,0,1]])`
+`skew(sxz=0.5,syz=0.333)`       | `multmatrix([[1,0,0.5,0],[0,1,0.333,0],[0,0,1,0],[0,0,0,1]])`
 
 [`BOSL2/shapes.scad`](https://github.com/revarbat/BOSL2/wiki/shapes.scad) Examples | Raw OpenSCAD Equivalent
 ---------------------------------- | -------------------------------
 `cube([10,20,30], anchor=BOTTOM);` | `translate([0,0,15]) cube([10,20,30], center=true);`
-`cuboid([20,20,30], fillet=5);`    | `minkowski() {cube([10,10,20], center=true); sphere(r=5, $fn=32);}`
+`cuboid([20,20,30], rounding=5);`  | `minkowski() {cube([10,10,20], center=true); sphere(r=5, $fn=32);}`
 `prismoid([30,40],[20,30],h=10);`  | `hull() {translate([0,0,0.005]) cube([30,40,0.01], center=true); translate([0,0,9.995]) cube([20,30,0.01],center=true);}`
 `xcyl(l=20,d=4);`                  | `rotate([0,90,0]) cylinder(h=20, d=4, center=true);`
-`cyl(l=100, d=40, fillet=5);`      | `translate([0,0,50]) minkowski() {cylinder(h=90, d=30, center=true); sphere(r=5);}`
+`cyl(l=100, d=40, rounding=5);`    | `translate([0,0,50]) minkowski() {cylinder(h=90, d=30, center=true); sphere(r=5);}`
 
 
 ## Documentation