chore: fix some typos (#1215)

Signed-off-by: yetyear <flite@outlook.com>

CHANGELOG.md

@@ -238,7 +238,7 @@
 * Prioritization to mutate each list of transactions from the corpus (#376, #395)
 * Improved array generation using generic mutations (#357)
 * Multiple coverage tracking according to the result of a transaction (#369)
-* Allow to control corpus mutation constans using a configuration file (#373)
+* Allow to control corpus mutation constants using a configuration file (#373)
 
 ## 1.4.0.1
 * HEVM updated to [af84e2ee0a0654fdaa91186384233cf1731ee7ce]

lib/Echidna/Output/Source.hs

@@ -68,7 +68,7 @@ coverageFileExtension Txt = ".txt"
 ppCoveredCode :: CoverageFileType -> SourceCache -> [SolcContract] -> CoverageMap -> IO Text
 ppCoveredCode fileType sc cs s | null s = pure "Coverage map is empty"
   | otherwise = do
-  -- List of covered lines during the fuzzing campaing
+  -- List of covered lines during the fuzzing campaign
   covLines <- srcMapCov sc s cs
   let
     -- Collect all the possible lines from all the files