Bundle Proguard rules

[mateuszkwiecinski]

Fixes #173

[github-actions]

Jar size:

Jar size change: +329.0B (3.1MiB -> 3.1MiB)

Diffuse output:

OLD: diffuse-source-file
NEW: pull-request-artifact.jar

       │          compressed          │          uncompressed          
       ├──────────┬──────────┬────────┼───────────┬───────────┬────────
 JAR   │ old      │ new      │ diff   │ old       │ new       │ diff   
───────┼──────────┼──────────┼────────┼───────────┼───────────┼────────
 class │ 55.2 KiB │ 55.2 KiB │    0 B │ 117.5 KiB │ 117.5 KiB │    0 B 
 other │    3 MiB │    3 MiB │ +329 B │   6.4 MiB │   6.4 MiB │ +172 B 
───────┼──────────┼──────────┼────────┼───────────┼───────────┼────────
 total │  3.1 MiB │  3.1 MiB │ +329 B │   6.5 MiB │   6.5 MiB │ +172 B 

 CLASSES │ old │ new │ diff      
─────────┼─────┼─────┼───────────
 classes │  24 │  24 │ 0 (+0 -0) 
 methods │ 630 │ 630 │ 0 (+0 -0) 
  fields │  67 │  67 │ 0 (+0 -0)

JAR

   compressed   │  uncompressed  │                                     
───────┬────────┼───────┬────────┤                                     
 size  │ diff   │ size  │ diff   │ path                                
───────┼────────┼───────┼────────┼─────────────────────────────────────
 215 B │ +215 B │ 172 B │ +172 B │ + META-INF/proguard/web-imageio.pro 
 114 B │ +114 B │   0 B │    0 B │ + META-INF/proguard/                
───────┼────────┼───────┼────────┼─────────────────────────────────────
 329 B │ +329 B │ 172 B │ +172 B │ (total)