Release 0.6.0

…hannel (#524)

**Transacation-manager**:
* add transaction to an encrypted channel

**data-access**:
* get channels from multiple topics

**Request-client.js**:
* get requests from multiple topics
* get requests from multiple identities

**Request-logic**:
* add getRequestsByMultipleTopics

**Transaction-manager**:
* add getChannelsByMultipleTopics

 - @requestnetwork/advanced-logic@0.4.3
 - @requestnetwork/data-access@0.5.0
 - @requestnetwork/data-format@0.4.3
 - @requestnetwork/epk-decryption@0.3.1
 - @requestnetwork/epk-signature@0.5.2
 - @requestnetwork/ethereum-storage@0.4.3
 - @requestnetwork/integration-test@0.4.3
 - @requestnetwork/prototype-estimator@1.3.3
 - @requestnetwork/request-client.js@0.7.0
 - @requestnetwork/request-logic@0.7.0
 - @requestnetwork/request-node@0.5.2
 - @requestnetwork/toolbox@0.1.1
 - @requestnetwork/transaction-manager@0.7.0
 - @requestnetwork/types@0.7.0
 - @requestnetwork/usage-examples@0.4.3
 - @requestnetwork/utils@0.6.1
 - @requestnetwork/web3-signature@0.4.3