Upgrade opensensemap-api to 0.1.4

[fabaff]

Description:

There was a typo which prevented the temperature to show up.

Example entry for configuration.yaml (if applicable):

air_quality:
  - platform: opensensemap
    station_id: STATION_ID

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable ([example][ex-requir]).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.