feat: move to async fs

Author: vacekj

src/calculator/index.ts

@@ -261,21 +261,21 @@ export default class Calculator {
   async estimateMatching(
     potentialVotes: Contribution[]
   ): Promise<MatchingEstimateResult> {
-    const votes = this.parseJSONFile<Vote>(
+    const votes = await this.parseJSONFile<Vote>(
       "votes",
       `${this.chainId}/rounds/${this.roundId}/votes.json`
     );
-    const applications = this.parseJSONFile<Application>(
+    const applications = await this.parseJSONFile<Application>(
       "applications",
       `${this.chainId}/rounds/${this.roundId}/applications.json`
     );
 
-    const rounds = this.parseJSONFile<Round>(
+    const rounds = await this.parseJSONFile<Round>(
       "rounds",
       `${this.chainId}/rounds.json`
     );
 
-    const passportScores = this.parseJSONFile<PassportScore>(
+    const passportScores = await this.parseJSONFile<PassportScore>(
       "passport scores",
       "passport_scores.json"
     );