Update to 1.74" stickers (#48)

* Update to 1.74" stickers

* Add updated date

* Update stickermule.md

.github/contributing.md

@@ -14,5 +14,5 @@ rsvg_png(paste0("SVG/", pkg, ".svg"), paste0("PNG/", pkg, ".png"), width = 2521,
 ### Specs
 
 * Point down hexagon
-* 2" high (point to point); 1.73" wide (side to side)
+* 2" high (point to point); 1.74" wide (side to side) (Updated 09/2020)
 * Default font: myriad pro

stickermule.md

@@ -1,7 +1,8 @@
 ## Stickermule
 
-If you want to print stickers from [stickermule.com](https://www.stickermule.com/) just upload a PNG or SVG version as a 2x2 Die cut sticker. When Stickermule sends you a proof for approval, it'll be resized to "Custom 1.73" x 2" Die cut sticker"  and will come out fine. Check out these [SVG tips](#svg_tips) for a hassle-free experience.
+If you want to print stickers from [stickermule.com](https://www.stickermule.com/) just upload a PNG or SVG version as a 2x2 Die cut sticker. When Stickermule sends you a proof for approval, it'll be resized to `Custom 1.74" x 2" Die cut sticker` and will come out fine. Check out these [SVG tips](#svg_tips) for a hassle-free experience.
 
+> Note: The *resized* size changed from `1.73"` to `1.74"` to accomodate the updated (09/2020) size requirements of `2521px`x`2911px`. Before 09/2020, stickers were resized to `Custom 1.73" x 2" Die cut sticker`. Stickers cut from each size can be intermingled.
 
 **Step by step**
 
@@ -16,7 +17,7 @@ If you want to print stickers from [stickermule.com](https://www.stickermule.com
 
 ![image](https://user-images.githubusercontent.com/1934546/32126617-7377b134-bb26-11e7-9594-5e987d600eb4.png)
 
-4) You are now good to go! 
+4) You are now good to go!
 
 
 ## SVG Tips