gaojin 0a4b2f19e3 use --no-cache-dir for docker build ...

use --no-cache can save about 90M
```
➜  freqtrade git:(develop) ✗ docker images freq
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
freq                latest              b15db8341067        7 minutes ago       800MB
➜  freqtrade git:(develop) ✗ docker images freq_nocache
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
freq_nocache        latest              e5731f28ac54        20 seconds ago      709MB
```

2018-09-17 10:37:25 +08:00

742 B

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