note optional dependencies
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README.md
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README.md
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@ -74,8 +74,20 @@ Install
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npm install --save greenlock@2.x
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npm install --save greenlock@2.x
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```
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```
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**Note**: Ignore errors related to `ursa`. It is an optional dependency used when available.
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<small>
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For many people it will not install properly, but it's only necessary on ARM devices (i.e. Raspberry Pi).
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**Optional** dependency for *more efficient* RSA key generation:
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```bash
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npm install --save ursa
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```
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(important for those on ARM devices like Raspberry Pi)
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**Optional** dependency for *Let's Encrypt v01* (pre-draft ACME spec) compatibility:
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```bash
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npm install --save le-acme-core
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```
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(important for those on ARM devices like Raspberry Pi)
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</small>
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### Production vs Staging
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### Production vs Staging
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