fix issue 393 (#397)

Author: lemire

README.md

@@ -24,18 +24,10 @@ we find that ada can be several times faster than popular competitors (system: A
 with LLVM 14).
 
 
-```mermaid
-gantt
-    title Processing time (ns/URL) on top100.txt
-    dateFormat  X
-    axisFormat %s
-
-    section ada
-    188   : 0, 188
-    section servo url
-    664   : 0, 664
-    section CURL
-    1471   : 0, 1471
+```
+      ada ▏  188 ns/URL ███▏
+servo url ▏  664 ns/URL ███████████▎
+     CURL ▏ 1471 ns/URL █████████████████████████
 ```
 
 ## Requirements

docs/cli.md

@@ -199,18 +199,12 @@ cat url-various-datasets/top100/top100.txt  0,00s user 0,01s system 11% cpu 0,06
 
 The results will vary depending on your system. We invite you to run your own benchmarks.
 
-```mermaid
-gantt
-    title Processing time (ms)
-    dateFormat  X
-    axisFormat %s
-
-    section ada
-    wikipedia_100k.txt   : 0, 55
-    section ada
-    top100   : 0, 61
-    section trurl
-    wikipedia_100k.txt   : 0, 180
-    section trurl
-    top100    : 0, 113
+```
+wikipedia 100k
+  ada ▏   55 ms ███████▋
+trurl ▏  180 ms █████████████████████████
+
+top100
+  ada ▏   61 ms █████████████▍
+trurl ▏  113 ms █████████████████████████
 ```