chore: add missing cmake dependency

.drone.yml

@@ -12,6 +12,7 @@ steps:
       - name: cache
         path: /_cache
     commands:
+      - apk add --update cmake
       - pwd
         # - |
         #   apt-get update && \

README.md

@@ -34,7 +34,8 @@ To use the project:
 
 To build the project from source:
 
-* GNU Make,
+* Make,
+* CMake
 * CrystalLang and Shards.
 
 ## Installation