fix: use correct BigNumber library

Author: monitz87

src/procedures/__tests__/ApproveErc20.ts

@@ -1,12 +1,11 @@
-import * as sinon from 'sinon';
 import { ImportMock, MockManager } from 'ts-mock-imports';
 import { SinonStub } from 'sinon';
 import * as contextModule from '../../Context';
 import * as polymathBaseModule from '../../PolymathBase';
 import * as contractWrappersModule from '@polymathnetwork/contract-wrappers';
+import { BigNumber } from '@polymathnetwork/contract-wrappers';
 import { ApproveErc20 } from '../../procedures/ApproveErc20';
 import { Procedure } from '~/procedures/Procedure';
-import BigNumber from 'bignumber.js';
 import { Wallet } from '~/Wallet';
 import { ProcedureType } from '~/types';
 

src/procedures/__tests__/ControllerTransfer.ts

@@ -1,7 +1,6 @@
-import * as sinon from 'sinon';
 import { ImportMock, MockManager } from 'ts-mock-imports';
 import { SinonStub } from 'sinon';
-import BigNumber from 'bignumber.js';
+import { BigNumber } from '@polymathnetwork/contract-wrappers';
 import * as contractWrappersModule from '@polymathnetwork/contract-wrappers';
 import * as contextModule from '../../Context';
 import * as wrappersModule from '../../PolymathBase';

src/procedures/__tests__/CreateErc20DividendDistribution.ts

@@ -1,7 +1,6 @@
-import * as sinon from 'sinon';
 import { ImportMock, MockManager } from 'ts-mock-imports';
 import { SinonStub } from 'sinon';
-import BigNumber from 'bignumber.js';
+import { BigNumber } from '@polymathnetwork/contract-wrappers';
 import * as contractWrappersModule from '@polymathnetwork/contract-wrappers';
 import * as contextModule from '../../Context';
 import * as wrappersModule from '../../PolymathBase';

src/procedures/__tests__/CreateEtherDividendDistribution.ts

@@ -1,7 +1,6 @@
-import * as sinon from 'sinon';
 import { ImportMock, MockManager } from 'ts-mock-imports';
 import { SinonStub } from 'sinon';
-import BigNumber from 'bignumber.js';
+import { BigNumber } from '@polymathnetwork/contract-wrappers';
 import * as contractWrappersModule from '@polymathnetwork/contract-wrappers';
 import * as contextModule from '../../Context';
 import * as wrappersModule from '../../PolymathBase';

src/procedures/__tests__/CreateSecurityToken.ts

@@ -1,6 +1,5 @@
-import * as sinon from 'sinon';
 import { ImportMock, MockManager } from 'ts-mock-imports';
-import BigNumber from 'bignumber.js';
+import { BigNumber } from '@polymathnetwork/contract-wrappers';
 import * as contractWrappersModule from '@polymathnetwork/contract-wrappers';
 import { SinonStub } from 'sinon';
 import * as contextModule from '../../Context';