Fix CI (#245)

- Bump MSRV for rust-lang/rust#78835
- Required by `fltk`: fltk-rs/fltk-rs#1054

Author: parasyte

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
         rust:
           - stable
           - beta
-          - 1.53.0
+          - 1.54.0
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
@@ -73,7 +73,7 @@ jobs:
         rust:
           - stable
           - beta
-          - 1.53.0
+          - 1.54.0
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2

MSRV.md

@@ -2,7 +2,7 @@
 
 | `pixels` version | `rustc` version |
 |------------------|-----------------|
-| `0.9.0`          | `1.53.0`        |
+| `0.9.0`          | `1.54.0`        |
 | `0.8.0`          | `1.52.0`        |
 | `0.7.0`          | `1.52.0`        |
 | `0.6.0`          | `1.52.0`        |