Merge pull request #508 from maxgiraldo/2020-02-sp-grammar

docs(CONTRIBUTING): fix spelling and grammar

Author: TheBlueMatt

CONTRIBUTING.md

@@ -7,8 +7,8 @@ testing and patches.
 
 Anyone is invited to contribute without regard to technical experience, "expertise", OSS
 experience, age, or other concern. However, the development of cryptocurrencies demands a
-high-level of rigor, adversial thinking, thorough testing and risk-minimization.
-Any bug may cost users real money. That said we deeply welcome people contributing
+high-level of rigor, adversarial thinking, thorough testing and risk-minimization.
+Any bug may cost users real money. That being said, we deeply welcome people contributing
 for the first time to an open source project or pick up Rust while contributing. Don't be shy,
 you'll learn.